diff --git a/cmd/beacon/main.go b/cmd/beacon/main.go
index fc98fd9..5017dff 100644
--- a/cmd/beacon/main.go
+++ b/cmd/beacon/main.go
@@ -6,6 +6,7 @@ package main
 import (
 	"context"
 	"encoding/hex"
+	"encoding/json"
 	"fmt"
 	"log/slog"
 	"net/http"
@@ -22,6 +23,7 @@ import (
 	"github.com/MeshCore-Beacon/beacon-server/internal/api/handlers"
 	"github.com/MeshCore-Beacon/beacon-server/internal/api/router"
 	"github.com/MeshCore-Beacon/beacon-server/internal/background"
+	"github.com/MeshCore-Beacon/beacon-server/internal/borders"
 	"github.com/MeshCore-Beacon/beacon-server/internal/cache"
 	"github.com/MeshCore-Beacon/beacon-server/internal/config"
 	"github.com/MeshCore-Beacon/beacon-server/internal/hub"
@@ -111,11 +113,16 @@ func main() {
 	}
 
 	resolved := config.Resolve(cfg)
-	localBorders, err := config.LoadLocalBorders(cfg)
+	borderFiles, err := config.LoadLocalBorders(cfg)
 	if err != nil {
 		slog.Error("invalid local border configuration", "component", "startup", "error", err)
 		os.Exit(1)
 	}
+	var localBorders *borders.Live
+	if cfg.Nodes.MarkForeign {
+		local, _ := config.BuildLocalBorders(borderFiles, nil) // checked by LoadLocalBorders
+		localBorders = borders.NewLive(local)
+	}
 
 	slog.Info(fmt.Sprintf("config: loaded — %s", resolved), "component", "startup")
 
@@ -201,6 +208,32 @@ func main() {
 		}
 	}
 
+	// Always restored, so disabling the import prunes it and file borders return.
+	zones := meshmapper.NewZones(cfg.MeshMapper.Zones, cfg.RegionIATAs(), store)
+	if cr, ok := reader.(*cache.CachedReader); ok {
+		zones.OnChange(cr.InvalidateIATABorder)
+	}
+	if localBorders != nil {
+		zones.OnUpdate(func(imported map[string]json.RawMessage) {
+			local, err := config.BuildLocalBorders(borderFiles, imported)
+			if err != nil {
+				slog.Error("MeshMapper boundaries rejected for foreign marking", "component", "meshmapper.zones", "error", err)
+				return
+			}
+			localBorders.Store(local)
+		})
+	}
+	restoreCtx, cancelRestore := context.WithTimeout(ctx, 10*time.Second)
+	err = zones.Restore(restoreCtx)
+	cancelRestore()
+	if err != nil {
+		slog.Error("failed to restore MeshMapper boundaries", "component", "startup", "error", err)
+		os.Exit(1)
+	}
+	if localBorders != nil && !localBorders.Ready() {
+		slog.Warn("nodes.mark_foreign has no boundaries yet; waiting for MeshMapper", "component", "startup")
+	}
+
 	// ── Build channel keystore ──────────────────────────────────────────────
 	entries := make(map[string][]keystore.Entry)
 
@@ -318,6 +351,9 @@ func main() {
 	if scopeImporter != nil {
 		tasks = append(tasks, background.Task{Name: "meshmapper.scopes", Interval: meshmapper.PollInterval, Run: scopeImporter.Refresh})
 	}
+	if cfg.MeshMapper.Zones.Enabled {
+		tasks = append(tasks, background.Task{Name: "meshmapper.zones", Interval: meshmapper.PollInterval, Run: zones.Refresh})
+	}
 	profiles := configureProfiling(ctx, pool)
 	defer profiles.Stop()
 	for i := range tasks {
diff --git a/config.yaml.example b/config.yaml.example
index 3e2a66f..0c6eb6e 100644
--- a/config.yaml.example
+++ b/config.yaml.example
@@ -47,6 +47,7 @@ iatas:
     lat: 49.1967
     lng: -123.1815
     # borderFile: borders/yvr.geojson   # optional GeoJSON Feature (Polygon/MultiPolygon)
+    #                                    # (meshmapper.zones overrides it when enabled)
     #                                    # for the region border map; path is relative to
     #                                    # this file's directory; validated at boot.
   YYJ:
@@ -159,8 +160,9 @@ websocket:
 # Node staleness, deletion, and clock-drift thresholds.
 #nodes:
 #  mark_foreign: false           # opt in to possiblyForeign on repeater nodes
-#                                # uses the union of configured iatas.*.borderFile polygons;
-#                                # requires at least one valid border; no packet filtering
+#                                # uses the union of configured iatas.*.borderFile polygons,
+#                                # with meshmapper.zones boundaries replacing them; requires
+#                                # a valid border file or meshmapper.zones; no packet filtering
 #  stale_threshold: 24h          # default: 24h
 #  delete_after: 720h            # default: 30 days
 #  clock_drift_threshold: 5m     # default: 5m
@@ -228,6 +230,16 @@ cache:
 #    refresh_interval: 1h  # 5m-24h; one source checked per 15s tick
 #    sources:
 #      YOW: https://yow.meshmapper.net/get_scopes.php
+#
+# Optional MeshMapper region boundaries (Zones API). Every IATA in a configured
+# region is looked up in its country's zone list, then its get_geojson.php outline
+# is imported. An imported boundary overrides that IATA's borderFile on the border
+# map and for nodes.mark_foreign. A missing or failed boundary keeps the last good
+# import, or the borderFile when there is none. Disabling, or removing an IATA from
+# every region, drops its import on restart. Logged under component=meshmapper.zones.
+#  zones:
+#    enabled: false
+#    refresh_interval: 24h # 1h-168h; one request per 15s tick, ETag-conditional
 
 # Background task intervals.
 # Shorter intervals are useful during initial deployment to confirm data is
diff --git a/db/meshmapper.go b/db/meshmapper.go
index 3ddbb28..0e2bc28 100644
--- a/db/meshmapper.go
+++ b/db/meshmapper.go
@@ -47,3 +47,40 @@ func (s *Store) SaveScopeCatalogue(ctx context.Context, iata, url string, cache
 	}
 	return s.q.SaveScopeCatalogue(ctx, params)
 }
+
+func (s *Store) PruneZoneBoundaries(ctx context.Context, keep []string) ([]string, error) {
+	if keep == nil {
+		keep = []string{}
+	}
+	return s.q.PruneZoneBoundaries(ctx, keep)
+}
+
+func (s *Store) ListZoneBoundaries(ctx context.Context) ([]meshmapper.Boundary, error) {
+	rows, err := s.q.ListZoneBoundaries(ctx)
+	if err != nil {
+		return nil, err
+	}
+	out := make([]meshmapper.Boundary, 0, len(rows))
+	for _, row := range rows {
+		b := meshmapper.Boundary{IATA: row.Iata, URL: row.Url, Feature: row.Feature, CheckedAt: row.CheckedAt.Time,
+			AttemptedAt: row.AttemptedAt.Time, NextAttempt: row.NextAttempt.Time, LastError: row.LastError}
+		if row.Etag != nil {
+			b.ETag = *row.Etag
+		}
+		out = append(out, b)
+	}
+	return out, nil
+}
+
+func (s *Store) SaveZoneBoundary(ctx context.Context, b meshmapper.Boundary) error {
+	params := sqlc.SaveZoneBoundaryParams{
+		Iata: b.IATA, Url: b.URL, Feature: b.Feature, LastError: b.LastError,
+		CheckedAt:   pgtype.Timestamptz{Time: b.CheckedAt, Valid: !b.CheckedAt.IsZero()},
+		AttemptedAt: pgtype.Timestamptz{Time: b.AttemptedAt, Valid: true},
+		NextAttempt: pgtype.Timestamptz{Time: b.NextAttempt, Valid: true},
+	}
+	if !b.CheckedAt.IsZero() {
+		params.Etag = &b.ETag
+	}
+	return s.q.SaveZoneBoundary(ctx, params)
+}
diff --git a/db/meshmapper_integration_test.go b/db/meshmapper_integration_test.go
index 06d7109..7d8c2a1 100644
--- a/db/meshmapper_integration_test.go
+++ b/db/meshmapper_integration_test.go
@@ -6,6 +6,7 @@ package db
 import (
 	"context"
 	"os"
+	"strings"
 	"testing"
 	"time"
 
@@ -137,3 +138,88 @@ func TestMeshMapperCataloguePostgres(t *testing.T) {
 		t.Fatal("partially committed catalogue", count, err)
 	}
 }
+
+func TestMeshMapperZoneBoundariesPostgres(t *testing.T) {
+	dsn := os.Getenv("BEACON_TEST_POSTGRES_DSN")
+	if dsn == "" {
+		t.Skip("set BEACON_TEST_POSTGRES_DSN")
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
+	defer cancel()
+	pool, err := pgxpool.New(ctx, dsn)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := RunMigrations(ctx, pool); err != nil {
+		pool.Close()
+		t.Fatal(err)
+	}
+	pool.Close()
+	conn, err := pgx.Connect(ctx, dsn)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer conn.Close(context.Background())
+	tx, err := conn.Begin(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer tx.Rollback(context.Background())
+	for _, table := range []string{"iata_codes", "meshmapper_zone_boundaries"} {
+		if _, err := tx.Exec(ctx, "CREATE TEMP TABLE "+table+" (LIKE public."+table+" INCLUDING ALL) ON COMMIT DROP"); err != nil {
+			t.Fatal(err)
+		}
+	}
+	store := &Store{q: sqlc.New(tx)}
+	manual := []byte(`{"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[0,0],[1,0],[1,1],[0,1],[0,0]]]},"properties":{"source":"file"}}`)
+	imported := []byte(`{"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[0,0],[2,0],[2,2],[0,2],[0,0]]]},"properties":{"code":"YOW"}}`)
+	if err := store.UpsertIATABorder(ctx, "YOW", manual); err != nil {
+		t.Fatal(err)
+	}
+	if err := store.UpsertIATA(ctx, "YYZ"); err != nil {
+		t.Fatal(err)
+	}
+	border := func(iata string) string {
+		t.Helper()
+		got, err := store.GetIATABorder(ctx, iata)
+		if err != nil {
+			t.Fatal(err)
+		}
+		return string(got)
+	}
+	if !strings.Contains(border("YOW"), `"file"`) || border("YYZ") != "" {
+		t.Fatal("manual border not served without an import")
+	}
+	now := time.Now().UTC().Truncate(time.Second)
+	good := meshmapper.Boundary{IATA: "YOW", URL: "https://yow.meshmapper.net/", Feature: imported, ETag: `"v1"`, CheckedAt: now, AttemptedAt: now, NextAttempt: now.Add(24 * time.Hour)}
+	if err := store.SaveZoneBoundary(ctx, good); err != nil {
+		t.Fatal(err)
+	}
+	if !strings.Contains(border("YOW"), `"YOW"`) {
+		t.Fatal("imported boundary did not override the manual border")
+	}
+	if err := store.UpsertIATABorder(ctx, "YOW", manual); err != nil {
+		t.Fatal(err)
+	}
+	failed := meshmapper.Boundary{IATA: "YOW", URL: good.URL, AttemptedAt: now.Add(time.Hour), NextAttempt: now.Add(2 * time.Hour), LastError: "HTTP 503"}
+	if err := store.SaveZoneBoundary(ctx, failed); err != nil {
+		t.Fatal(err)
+	}
+	rows, err := store.ListZoneBoundaries(ctx)
+	if err != nil || len(rows) != 1 || !strings.Contains(string(rows[0].Feature), `"YOW"`) || rows[0].ETag != `"v1"` ||
+		!rows[0].CheckedAt.Equal(now) || rows[0].LastError != "HTTP 503" || !rows[0].NextAttempt.Equal(failed.NextAttempt) {
+		t.Fatal("failure or reseed lost the last good boundary", rows, err)
+	}
+	if !strings.Contains(border("YOW"), `"YOW"`) {
+		t.Fatal("reseeding the manual border undid the override")
+	}
+	if pruned, err := store.PruneZoneBoundaries(ctx, []string{"YOW"}); err != nil || len(pruned) != 0 {
+		t.Fatal("configured import pruned", pruned, err)
+	}
+	if pruned, err := store.PruneZoneBoundaries(ctx, nil); err != nil || len(pruned) != 1 || pruned[0] != "YOW" {
+		t.Fatal(pruned, err)
+	}
+	if !strings.Contains(border("YOW"), `"file"`) {
+		t.Fatal("manual border did not return after pruning")
+	}
+}
diff --git a/db/migrations/044_meshmapper_zones.sql b/db/migrations/044_meshmapper_zones.sql
new file mode 100644
index 0000000..0103225
--- /dev/null
+++ b/db/migrations/044_meshmapper_zones.sql
@@ -0,0 +1,15 @@
+-- Copyright 2026 Beacon Contributors
+-- SPDX-License-Identifier: AGPL-3.0-or-later
+
+-- Imported MeshMapper region boundaries. Kept apart from iata_codes.border so
+-- startup seeding of manual borderFile borders never undoes the override.
+CREATE TABLE IF NOT EXISTS meshmapper_zone_boundaries (
+    iata TEXT PRIMARY KEY,
+    url TEXT NOT NULL,
+    feature JSONB,
+    etag TEXT,
+    checked_at TIMESTAMPTZ,
+    attempted_at TIMESTAMPTZ NOT NULL,
+    next_attempt TIMESTAMPTZ NOT NULL,
+    last_error TEXT NOT NULL DEFAULT ''
+);
diff --git a/db/queries/queries.sql b/db/queries/queries.sql
index c206a2f..941b340 100644
--- a/db/queries/queries.sql
+++ b/db/queries/queries.sql
@@ -25,10 +25,13 @@ ON CONFLICT (iata) DO UPDATE SET
     approx_lng   = EXCLUDED.approx_lng;
 
 -- name: GetIATABorder :one
--- border is NULL when the IATA exists but has no border configured; a
--- missing row (unknown IATA) is sql.ErrNoRows, same not-found distinction
--- GetIATA already makes.
-SELECT border FROM iata_codes WHERE iata = $1;
+-- An imported MeshMapper boundary overrides the configured one. border is NULL
+-- when neither exists; a missing row (unknown IATA) is sql.ErrNoRows, same
+-- not-found distinction GetIATA already makes.
+SELECT COALESCE(z.feature, i.border)::jsonb AS border
+FROM iata_codes i
+LEFT JOIN meshmapper_zone_boundaries z ON z.iata = i.iata
+WHERE i.iata = $1;
 
 -- name: UpsertIATABorder :exec
 -- Written by the config-file-driven seeder (internal/config/seed.go), not a
@@ -1627,3 +1630,24 @@ ON CONFLICT (iata, url) DO UPDATE SET
     attempted_at = EXCLUDED.attempted_at,
     next_attempt = EXCLUDED.next_attempt,
     last_error = EXCLUDED.last_error;
+
+-- name: ListZoneBoundaries :many
+SELECT * FROM meshmapper_zone_boundaries ORDER BY iata;
+
+-- name: SaveZoneBoundary :exec
+-- NULL feature/etag/checked_at retain the last good boundary after an error or 304.
+INSERT INTO meshmapper_zone_boundaries (iata, url, feature, etag, checked_at, attempted_at, next_attempt, last_error)
+VALUES (@iata, @url, sqlc.narg(feature)::jsonb, sqlc.narg(etag)::text,
+    sqlc.narg(checked_at)::timestamptz, @attempted_at, @next_attempt, @last_error)
+ON CONFLICT (iata) DO UPDATE SET
+    url = EXCLUDED.url,
+    feature = COALESCE(EXCLUDED.feature, meshmapper_zone_boundaries.feature),
+    etag = COALESCE(EXCLUDED.etag, meshmapper_zone_boundaries.etag),
+    checked_at = COALESCE(EXCLUDED.checked_at, meshmapper_zone_boundaries.checked_at),
+    attempted_at = EXCLUDED.attempted_at,
+    next_attempt = EXCLUDED.next_attempt,
+    last_error = EXCLUDED.last_error;
+
+-- name: PruneZoneBoundaries :many
+-- Drops imports for IATAs no longer configured, so their manual border returns.
+DELETE FROM meshmapper_zone_boundaries WHERE NOT (iata = ANY(@keep::text[])) RETURNING iata;
diff --git a/db/sqlc/mock/querier.go b/db/sqlc/mock/querier.go
index 82d1660..86beeec 100644
--- a/db/sqlc/mock/querier.go
+++ b/db/sqlc/mock/querier.go
@@ -11,6 +11,7 @@ package mockdb
 
 import (
 	context "context"
+	json "encoding/json"
 	reflect "reflect"
 
 	db "github.com/MeshCore-Beacon/beacon-server/db/sqlc"
@@ -265,10 +266,10 @@ func (mr *MockQuerierMockRecorder) GetIATA(ctx, iata any) *gomock.Call {
 }
 
 // GetIATABorder mocks base method.
-func (m *MockQuerier) GetIATABorder(ctx context.Context, iata string) ([]byte, error) {
+func (m *MockQuerier) GetIATABorder(ctx context.Context, iata string) (json.RawMessage, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "GetIATABorder", ctx, iata)
-	ret0, _ := ret[0].([]byte)
+	ret0, _ := ret[0].(json.RawMessage)
 	ret1, _ := ret[1].(error)
 	return ret0, ret1
 }
@@ -1313,6 +1314,36 @@ func (mr *MockQuerierMockRecorder) ListUndecryptedGroupTextPackets(ctx any) *gom
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ListUndecryptedGroupTextPackets", reflect.TypeOf((*MockQuerier)(nil).ListUndecryptedGroupTextPackets), ctx)
 }
 
+// ListZoneBoundaries mocks base method.
+func (m *MockQuerier) ListZoneBoundaries(ctx context.Context) ([]db.MeshmapperZoneBoundary, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "ListZoneBoundaries", ctx)
+	ret0, _ := ret[0].([]db.MeshmapperZoneBoundary)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// ListZoneBoundaries indicates an expected call of ListZoneBoundaries.
+func (mr *MockQuerierMockRecorder) ListZoneBoundaries(ctx any) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ListZoneBoundaries", reflect.TypeOf((*MockQuerier)(nil).ListZoneBoundaries), ctx)
+}
+
+// PruneZoneBoundaries mocks base method.
+func (m *MockQuerier) PruneZoneBoundaries(ctx context.Context, keep []string) ([]string, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "PruneZoneBoundaries", ctx, keep)
+	ret0, _ := ret[0].([]string)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// PruneZoneBoundaries indicates an expected call of PruneZoneBoundaries.
+func (mr *MockQuerierMockRecorder) PruneZoneBoundaries(ctx, keep any) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "PruneZoneBoundaries", reflect.TypeOf((*MockQuerier)(nil).PruneZoneBoundaries), ctx, keep)
+}
+
 // ReconfirmNeighbors mocks base method.
 func (m *MockQuerier) ReconfirmNeighbors(ctx context.Context) error {
 	m.ctrl.T.Helper()
@@ -1586,6 +1617,20 @@ func (mr *MockQuerierMockRecorder) SaveScopeCatalogue(ctx, arg any) *gomock.Call
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SaveScopeCatalogue", reflect.TypeOf((*MockQuerier)(nil).SaveScopeCatalogue), ctx, arg)
 }
 
+// SaveZoneBoundary mocks base method.
+func (m *MockQuerier) SaveZoneBoundary(ctx context.Context, arg db.SaveZoneBoundaryParams) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "SaveZoneBoundary", ctx, arg)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// SaveZoneBoundary indicates an expected call of SaveZoneBoundary.
+func (mr *MockQuerierMockRecorder) SaveZoneBoundary(ctx, arg any) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SaveZoneBoundary", reflect.TypeOf((*MockQuerier)(nil).SaveZoneBoundary), ctx, arg)
+}
+
 // SearchKnownRoutes mocks base method.
 func (m *MockQuerier) SearchKnownRoutes(ctx context.Context, arg db.SearchKnownRoutesParams) ([]db.SearchKnownRoutesRow, error) {
 	m.ctrl.T.Helper()
diff --git a/db/sqlc/models.go b/db/sqlc/models.go
index 86fe98e..bf81a1d 100644
--- a/db/sqlc/models.go
+++ b/db/sqlc/models.go
@@ -245,6 +245,17 @@ type MeshmapperScopeCatalogue struct {
 	LastError   string             `json:"last_error"`
 }
 
+type MeshmapperZoneBoundary struct {
+	Iata        string             `json:"iata"`
+	Url         string             `json:"url"`
+	Feature     []byte             `json:"feature"`
+	Etag        *string            `json:"etag"`
+	CheckedAt   pgtype.Timestamptz `json:"checked_at"`
+	AttemptedAt pgtype.Timestamptz `json:"attempted_at"`
+	NextAttempt pgtype.Timestamptz `json:"next_attempt"`
+	LastError   string             `json:"last_error"`
+}
+
 type MvHourlyIataStat struct {
 	Iata             string             `json:"iata"`
 	Hour             pgtype.Timestamptz `json:"hour"`
diff --git a/db/sqlc/querier.go b/db/sqlc/querier.go
index 6d699a9..364aea6 100644
--- a/db/sqlc/querier.go
+++ b/db/sqlc/querier.go
@@ -6,6 +6,7 @@ package db
 
 import (
 	"context"
+	"encoding/json"
 
 	"github.com/google/uuid"
 	"github.com/jackc/pgx/v5/pgtype"
@@ -46,10 +47,10 @@ type Querier interface {
 	GetCrossIATANeighbors(ctx context.Context, arg GetCrossIATANeighborsParams) ([]GetCrossIATANeighborsRow, error)
 	GetHourlyStats(ctx context.Context, arg GetHourlyStatsParams) ([]MvHourlyIataStat, error)
 	GetIATA(ctx context.Context, iata string) (IataCode, error)
-	// border is NULL when the IATA exists but has no border configured; a
-	// missing row (unknown IATA) is sql.ErrNoRows, same not-found distinction
-	// GetIATA already makes.
-	GetIATABorder(ctx context.Context, iata string) ([]byte, error)
+	// An imported MeshMapper boundary overrides the configured one. border is NULL
+	// when neither exists; a missing row (unknown IATA) is sql.ErrNoRows, same
+	// not-found distinction GetIATA already makes.
+	GetIATABorder(ctx context.Context, iata string) (json.RawMessage, error)
 	GetKnownRoutesByNode(ctx context.Context, arg GetKnownRoutesByNodeParams) ([]GetKnownRoutesByNodeRow, error)
 	GetNodeByID(ctx context.Context, id uuid.UUID) (GetNodeByIDRow, error)
 	GetNodeByPubkey(ctx context.Context, publicKey []byte) (uuid.UUID, error)
@@ -220,6 +221,9 @@ type Querier interface {
 	// to the config after they'd already been ingested -- see
 	// internal/ingest.BackfillChannelMessages.
 	ListUndecryptedGroupTextPackets(ctx context.Context) ([]ListUndecryptedGroupTextPacketsRow, error)
+	ListZoneBoundaries(ctx context.Context) ([]MeshmapperZoneBoundary, error)
+	// Drops imports for IATAs no longer configured, so their manual border returns.
+	PruneZoneBoundaries(ctx context.Context, keep []string) ([]string, error)
 	// Delete node_neighbors where the neighbor has departed from node_short_ids
 	// for that IATA, or where its prefix_4 is now ambiguous.
 	ReconfirmNeighbors(ctx context.Context) error
@@ -260,6 +264,8 @@ type Querier interface {
 	// Empty arrays insert nothing. NULL payload/checked_at retain last-known-good data
 	// after an error or 304. Imported names never replace existing manual metadata.
 	SaveScopeCatalogue(ctx context.Context, arg SaveScopeCatalogueParams) error
+	// NULL feature/etag/checked_at retain the last good boundary after an error or 304.
+	SaveZoneBoundary(ctx context.Context, arg SaveZoneBoundaryParams) error
 	// Returns known routes containing a subsequence from source to destination hash prefix.
 	// Verifies source appears before destination in the route.
 	SearchKnownRoutes(ctx context.Context, arg SearchKnownRoutesParams) ([]SearchKnownRoutesRow, error)
diff --git a/db/sqlc/queries.sql.go b/db/sqlc/queries.sql.go
index 0a5aa36..ce7bb12 100644
--- a/db/sqlc/queries.sql.go
+++ b/db/sqlc/queries.sql.go
@@ -7,6 +7,7 @@ package db
 
 import (
 	"context"
+	"encoding/json"
 
 	"github.com/google/uuid"
 	"github.com/jackc/pgx/v5/pgtype"
@@ -390,15 +391,18 @@ func (q *Queries) GetIATA(ctx context.Context, iata string) (IataCode, error) {
 }
 
 const getIATABorder = `-- name: GetIATABorder :one
-SELECT border FROM iata_codes WHERE iata = $1
+SELECT COALESCE(z.feature, i.border)::jsonb AS border
+FROM iata_codes i
+LEFT JOIN meshmapper_zone_boundaries z ON z.iata = i.iata
+WHERE i.iata = $1
 `
 
-// border is NULL when the IATA exists but has no border configured; a
-// missing row (unknown IATA) is sql.ErrNoRows, same not-found distinction
-// GetIATA already makes.
-func (q *Queries) GetIATABorder(ctx context.Context, iata string) ([]byte, error) {
+// An imported MeshMapper boundary overrides the configured one. border is NULL
+// when neither exists; a missing row (unknown IATA) is sql.ErrNoRows, same
+// not-found distinction GetIATA already makes.
+func (q *Queries) GetIATABorder(ctx context.Context, iata string) (json.RawMessage, error) {
 	row := q.db.QueryRow(ctx, getIATABorder, iata)
-	var border []byte
+	var border json.RawMessage
 	err := row.Scan(&border)
 	return border, err
 }
@@ -3975,6 +3979,64 @@ func (q *Queries) ListUndecryptedGroupTextPackets(ctx context.Context) ([]ListUn
 	return items, nil
 }
 
+const listZoneBoundaries = `-- name: ListZoneBoundaries :many
+SELECT iata, url, feature, etag, checked_at, attempted_at, next_attempt, last_error FROM meshmapper_zone_boundaries ORDER BY iata
+`
+
+func (q *Queries) ListZoneBoundaries(ctx context.Context) ([]MeshmapperZoneBoundary, error) {
+	rows, err := q.db.Query(ctx, listZoneBoundaries)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	items := []MeshmapperZoneBoundary{}
+	for rows.Next() {
+		var i MeshmapperZoneBoundary
+		if err := rows.Scan(
+			&i.Iata,
+			&i.Url,
+			&i.Feature,
+			&i.Etag,
+			&i.CheckedAt,
+			&i.AttemptedAt,
+			&i.NextAttempt,
+			&i.LastError,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
+const pruneZoneBoundaries = `-- name: PruneZoneBoundaries :many
+DELETE FROM meshmapper_zone_boundaries WHERE NOT (iata = ANY($1::text[])) RETURNING iata
+`
+
+// Drops imports for IATAs no longer configured, so their manual border returns.
+func (q *Queries) PruneZoneBoundaries(ctx context.Context, keep []string) ([]string, error) {
+	rows, err := q.db.Query(ctx, pruneZoneBoundaries, keep)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	items := []string{}
+	for rows.Next() {
+		var iata string
+		if err := rows.Scan(&iata); err != nil {
+			return nil, err
+		}
+		items = append(items, iata)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
 const reconfirmNeighbors = `-- name: ReconfirmNeighbors :exec
 DELETE FROM node_neighbors nn
 WHERE NOT EXISTS (
@@ -4522,6 +4584,46 @@ func (q *Queries) SaveScopeCatalogue(ctx context.Context, arg SaveScopeCatalogue
 	return err
 }
 
+const saveZoneBoundary = `-- name: SaveZoneBoundary :exec
+INSERT INTO meshmapper_zone_boundaries (iata, url, feature, etag, checked_at, attempted_at, next_attempt, last_error)
+VALUES ($1, $2, $3::jsonb, $4::text,
+    $5::timestamptz, $6, $7, $8)
+ON CONFLICT (iata) DO UPDATE SET
+    url = EXCLUDED.url,
+    feature = COALESCE(EXCLUDED.feature, meshmapper_zone_boundaries.feature),
+    etag = COALESCE(EXCLUDED.etag, meshmapper_zone_boundaries.etag),
+    checked_at = COALESCE(EXCLUDED.checked_at, meshmapper_zone_boundaries.checked_at),
+    attempted_at = EXCLUDED.attempted_at,
+    next_attempt = EXCLUDED.next_attempt,
+    last_error = EXCLUDED.last_error
+`
+
+type SaveZoneBoundaryParams struct {
+	Iata        string             `json:"iata"`
+	Url         string             `json:"url"`
+	Feature     []byte             `json:"feature"`
+	Etag        *string            `json:"etag"`
+	CheckedAt   pgtype.Timestamptz `json:"checked_at"`
+	AttemptedAt pgtype.Timestamptz `json:"attempted_at"`
+	NextAttempt pgtype.Timestamptz `json:"next_attempt"`
+	LastError   string             `json:"last_error"`
+}
+
+// NULL feature/etag/checked_at retain the last good boundary after an error or 304.
+func (q *Queries) SaveZoneBoundary(ctx context.Context, arg SaveZoneBoundaryParams) error {
+	_, err := q.db.Exec(ctx, saveZoneBoundary,
+		arg.Iata,
+		arg.Url,
+		arg.Feature,
+		arg.Etag,
+		arg.CheckedAt,
+		arg.AttemptedAt,
+		arg.NextAttempt,
+		arg.LastError,
+	)
+	return err
+}
+
 const searchKnownRoutes = `-- name: SearchKnownRoutes :many
 SELECT id, node_ids, hash_prefix, iata, hop_count, first_seen, last_seen, observation_count
 FROM known_routes
diff --git a/internal/api/local_borders.go b/internal/api/local_borders.go
index 278f7f0..65e44a0 100644
--- a/internal/api/local_borders.go
+++ b/internal/api/local_borders.go
@@ -12,9 +12,9 @@ import (
 )
 
 // WithLocalBorders annotates node responses after cache reads. Historical rows
-// use the current startup configuration without extra SQL or cached-policy drift.
+// use the current boundaries without extra SQL or cached-policy drift.
 // Cached values are copied; the decorator never changes its inner reader's data.
-func WithLocalBorders(reader Reader, local *borders.Local) Reader {
+func WithLocalBorders(reader Reader, local *borders.Live) Reader {
 	if local == nil {
 		return reader
 	}
@@ -23,7 +23,7 @@ func WithLocalBorders(reader Reader, local *borders.Local) Reader {
 
 type localBorderReader struct {
 	Reader
-	local *borders.Local
+	local *borders.Live
 }
 
 func (r *localBorderReader) ListNodes(ctx context.Context, nodeType int16, iatas []string, paths, traces *bool, pubkey []byte, prefix, name, scope string, cursor int64, limit int32, neighbors bool) (Page[NodeSummary], error) {
diff --git a/internal/api/local_borders_test.go b/internal/api/local_borders_test.go
index 033f37d..d7f0b01 100644
--- a/internal/api/local_borders_test.go
+++ b/internal/api/local_borders_test.go
@@ -52,8 +52,8 @@ func TestLocalBordersAfterCache(t *testing.T) {
 	client := cache.NewClient(mr.Addr(), "", 0)
 	t.Cleanup(func() { client.Close() })
 	cached := cache.NewCachedReader(base, client, cache.CacheTTLs{Nodes: time.Hour})
-	first := api.WithLocalBorders(cached, local)
-	second := api.WithLocalBorders(cached, other)
+	first := api.WithLocalBorders(cached, borders.NewLive(local))
+	second := api.WithLocalBorders(cached, borders.NewLive(other))
 	if api.WithLocalBorders(cached, nil) != cached {
 		t.Fatal("disabled decorator changed reader")
 	}
@@ -110,7 +110,7 @@ func TestLocalBordersPreserveReaderErrors(t *testing.T) {
 	}
 	want := errors.New("reader unavailable")
 	base := &borderReader{err: want}
-	reader := api.WithLocalBorders(base, local)
+	reader := api.WithLocalBorders(base, borders.NewLive(local))
 	if _, err := reader.GetNode(context.Background(), uuid.New()); !errors.Is(err, want) {
 		t.Fatal(err)
 	}
diff --git a/internal/borders/borders_test.go b/internal/borders/borders_test.go
index c5d4fdf..687f84d 100644
--- a/internal/borders/borders_test.go
+++ b/internal/borders/borders_test.go
@@ -114,3 +114,28 @@ func BenchmarkPossiblyForeign(b *testing.B) {
 		})
 	}
 }
+
+func TestLiveSwap(t *testing.T) {
+	var disabled *Live
+	if disabled.PossiblyForeign(2, new(15.0), new(15.0)) != nil {
+		t.Fatal("nil live classified")
+	}
+	live := NewLive(nil)
+	if disabled.Ready() || live.Ready() {
+		t.Fatal("ready without boundaries")
+	}
+	if live.PossiblyForeign(2, new(15.0), new(15.0)) != nil {
+		t.Fatal("empty live classified")
+	}
+	local, err := New([]orb.Polygon{{{{10, 10}, {20, 10}, {20, 20}, {10, 20}, {10, 10}}}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	live.Store(local)
+	if !live.Ready() {
+		t.Fatal("not ready after store")
+	}
+	if got := live.PossiblyForeign(2, new(15.0), new(15.0)); got == nil || *got {
+		t.Fatal("stored classifier not used", got)
+	}
+}
diff --git a/internal/borders/live.go b/internal/borders/live.go
new file mode 100644
index 0000000..ae8294e
--- /dev/null
+++ b/internal/borders/live.go
@@ -0,0 +1,28 @@
+// Copyright 2026 Beacon Contributors
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+package borders
+
+import "sync/atomic"
+
+// Live lets boundary refreshes replace the classifier under concurrent readers.
+// A nil Live disables classification; an empty one reports unknown until stored.
+type Live struct{ current atomic.Pointer[Local] }
+
+func NewLive(local *Local) *Live {
+	live := &Live{}
+	live.current.Store(local)
+	return live
+}
+
+func (l *Live) Store(local *Local) { l.current.Store(local) }
+
+// Ready reports whether any boundary is loaded.
+func (l *Live) Ready() bool { return l != nil && l.current.Load() != nil }
+
+func (l *Live) PossiblyForeign(role int16, lat, lng *float64) *bool {
+	if l == nil {
+		return nil
+	}
+	return l.current.Load().PossiblyForeign(role, lat, lng)
+}
diff --git a/internal/cache/cache_test.go b/internal/cache/cache_test.go
index 2251531..147b9da 100644
--- a/internal/cache/cache_test.go
+++ b/internal/cache/cache_test.go
@@ -396,6 +396,17 @@ func TestInvalidateScopeNamesClearsDerivedKeys(t *testing.T) {
 	}
 }
 
+func TestInvalidateIATABorder(t *testing.T) {
+	c, mr := newTestClient(t)
+	cr := &CachedReader{inner: &stubReader{}, c: c, ttl: CacheTTLs{}}
+	mr.Set(keyIATABorderPrefix+"YOW", "x")
+	mr.Set(keyIATABorderPrefix+"YYZ", "keep")
+	cr.InvalidateIATABorder(context.Background(), "YOW")
+	if got := mr.Keys(); len(got) != 1 || got[0] != keyIATABorderPrefix+"YYZ" {
+		t.Fatalf("keys left: %v", got)
+	}
+}
+
 func TestCachedReader_InvalidateNode(t *testing.T) {
 	c, mr := newTestClient(t)
 	nodeID := uuid.MustParse("00000000-0000-0000-0000-000000000001")
diff --git a/internal/cache/reader.go b/internal/cache/reader.go
index 2dd3dda..2273447 100644
--- a/internal/cache/reader.go
+++ b/internal/cache/reader.go
@@ -87,6 +87,11 @@ func (cr *CachedReader) InvalidateScopeNames(ctx context.Context) {
 	cr.c.delPrefix(ctx, keyScopeByNamePrefix)
 }
 
+// InvalidateIATABorder makes an imported or removed MeshMapper boundary visible.
+func (cr *CachedReader) InvalidateIATABorder(ctx context.Context, iata string) {
+	cr.c.del(ctx, keyIATABorderPrefix+iata)
+}
+
 // InvalidateNode removes the cached entries for a node by UUID.
 // Should be called from the ingest path after a node upsert.
 func (cr *CachedReader) InvalidateNode(ctx context.Context, nodeID uuid.UUID) {
diff --git a/internal/config/config.go b/internal/config/config.go
index b8b8fff..85df469 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -271,8 +271,9 @@ type RoutesConfig struct {
 
 // NodesConfig controls node-derived signal thresholds.
 type NodesConfig struct {
-	// MarkForeign annotates repeaters outside the union of configured IATA border
-	// files. Disabled by default; enabling it requires at least one usable border.
+	// MarkForeign annotates repeaters outside the union of IATA borders, with
+	// imported MeshMapper boundaries replacing border files. Disabled by default;
+	// enabling it requires a border file or meshmapper.zones.
 	MarkForeign bool `yaml:"mark_foreign"`
 	// ClockDriftThreshold is the |device clock - server clock| magnitude, measured from a
 	// repeater/room server's ADVERT timestamp, above which the node API reports
@@ -412,6 +413,9 @@ func Load(path string) (*Config, error) {
 	if err := cfg.validateMeshMapper(); err != nil {
 		return nil, err
 	}
+	if cfg.Nodes.MarkForeign && !cfg.MeshMapper.Zones.Enabled && !cfg.hasBorderFile() {
+		return nil, fmt.Errorf("nodes.mark_foreign requires an iatas.*.borderFile or meshmapper.zones")
+	}
 	for iata, details := range cfg.IATAs {
 		if details.BorderFile != "" && !filepath.IsAbs(details.BorderFile) {
 			details.BorderFile = filepath.Join(configDir, details.BorderFile)
diff --git a/internal/config/foreign_borders.go b/internal/config/foreign_borders.go
index a9ca62e..eb5c410 100644
--- a/internal/config/foreign_borders.go
+++ b/internal/config/foreign_borders.go
@@ -4,31 +4,38 @@
 package config
 
 import (
+	"encoding/json"
 	"fmt"
+	"maps"
 	"os"
-	"sort"
+	"slices"
 
 	"github.com/MeshCore-Beacon/beacon-server/internal/borders"
 	"github.com/paulmach/orb"
 	"github.com/paulmach/orb/geojson"
 )
 
-// LoadLocalBorders builds one startup-only classifier from configured border
-// files. IATA airport coordinates and auto-discovered IATAs are not boundaries.
-func LoadLocalBorders(cfg *Config) (*borders.Local, error) {
+func (c *Config) hasBorderFile() bool {
+	for _, details := range c.IATAs {
+		if details.BorderFile != "" {
+			return true
+		}
+	}
+	return false
+}
+
+// LoadLocalBorders reads the validated border files used for foreign marking,
+// keyed by IATA. IATA airport coordinates are not boundaries. Nil when disabled.
+func LoadLocalBorders(cfg *Config) (map[string]json.RawMessage, error) {
 	if !cfg.Nodes.MarkForeign {
 		return nil, nil
 	}
-	var codes []string
+	files := map[string]json.RawMessage{}
 	for code, details := range cfg.IATAs {
-		if details.BorderFile != "" {
-			codes = append(codes, code)
+		if details.BorderFile == "" {
+			continue
 		}
-	}
-	sort.Strings(codes)
-	var polygons []orb.Polygon
-	for _, code := range codes {
-		raw, err := os.ReadFile(cfg.IATAs[code].BorderFile)
+		raw, err := os.ReadFile(details.BorderFile)
 		if err != nil {
 			return nil, fmt.Errorf("nodes.mark_foreign: reading border for %s: %w", code, err)
 		}
@@ -36,7 +43,29 @@ func LoadLocalBorders(cfg *Config) (*borders.Local, error) {
 		if err != nil {
 			return nil, fmt.Errorf("nodes.mark_foreign: invalid border for %s: %w", code, err)
 		}
-		feature, err := geojson.UnmarshalFeature(validated)
+		files[code] = validated
+	}
+	// Fail at startup rather than on the first rebuild.
+	if _, err := BuildLocalBorders(files, nil); err != nil {
+		return nil, err
+	}
+	return files, nil
+}
+
+// BuildLocalBorders unions validated borders; an imported boundary replaces
+// the same IATA's file. Nil when there are none.
+func BuildLocalBorders(files, imported map[string]json.RawMessage) (*borders.Local, error) {
+	merged := maps.Clone(files)
+	if merged == nil {
+		merged = map[string]json.RawMessage{}
+	}
+	maps.Copy(merged, imported)
+	if len(merged) == 0 {
+		return nil, nil
+	}
+	var polygons []orb.Polygon
+	for _, code := range slices.Sorted(maps.Keys(merged)) {
+		feature, err := geojson.UnmarshalFeature(merged[code])
 		if err != nil {
 			return nil, fmt.Errorf("nodes.mark_foreign: decoding border for %s: %w", code, err)
 		}
diff --git a/internal/config/foreign_borders_test.go b/internal/config/foreign_borders_test.go
index d158f91..e39e6b7 100644
--- a/internal/config/foreign_borders_test.go
+++ b/internal/config/foreign_borders_test.go
@@ -4,6 +4,7 @@
 package config
 
 import (
+	"encoding/json"
 	"os"
 	"path/filepath"
 	"strings"
@@ -22,16 +23,27 @@ func TestLoadLocalBorders(t *testing.T) {
 	if got, err := LoadLocalBorders(&Config{}); err != nil || got != nil {
 		t.Fatalf("disabled: %v %v", got, err)
 	}
-	if _, err := LoadLocalBorders(&Config{Nodes: NodesConfig{MarkForeign: true}}); err == nil {
-		t.Fatal("enabled with no border")
-	}
 	dir := t.TempDir()
+	path := filepath.Join(dir, "config.yaml")
+	for _, tc := range []struct {
+		text string
+		bad  bool
+	}{
+		{"nodes:\n  mark_foreign: true\n", true},
+		{"nodes:\n  mark_foreign: true\nregions:\n  - slug: a\n    iatas: [AAA]\nmeshmapper:\n  zones:\n    enabled: true\n", false},
+	} {
+		if err := os.WriteFile(path, []byte(tc.text), 0600); err != nil {
+			t.Fatal(err)
+		}
+		if _, err := Load(path); (err != nil) != tc.bad {
+			t.Fatalf("%q: %v", tc.text, err)
+		}
+	}
 	border := filepath.Join(dir, "region.json")
 	raw := `{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[10,10],[20,10],[20,20],[10,20],[10,10]]],[[[30,10],[40,10],[40,20],[30,20],[30,10]]]]}}`
 	if err := os.WriteFile(border, []byte(raw), 0600); err != nil {
 		t.Fatal(err)
 	}
-	path := filepath.Join(dir, "config.yaml")
 	if err := os.WriteFile(path, []byte("nodes:\n  mark_foreign: true\niatas:\n  AAA:\n    borderFile: region.json\n  BBB:\n    name: Airport without an operating border\n"), 0600); err != nil {
 		t.Fatal(err)
 	}
@@ -39,13 +51,31 @@ func TestLoadLocalBorders(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	local, err := LoadLocalBorders(cfg)
+	files, err := LoadLocalBorders(cfg)
+	if err != nil || len(files) != 1 {
+		t.Fatal(files, err)
+	}
+	local, err := BuildLocalBorders(files, nil)
 	if err != nil {
 		t.Fatal(err)
 	}
 	if *local.PossiblyForeign(2, new(15.0), new(15.0)) || *local.PossiblyForeign(2, new(15.0), new(35.0)) || !*local.PossiblyForeign(2, new(25.0), new(25.0)) {
 		t.Fatal("polygon union not used")
 	}
+	imported := map[string]json.RawMessage{"AAA": json.RawMessage(`{"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[50,50],[60,50],[60,60],[50,60],[50,50]]]}}`)}
+	replaced, err := BuildLocalBorders(files, imported)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !*replaced.PossiblyForeign(2, new(15.0), new(15.0)) || *replaced.PossiblyForeign(2, new(55.0), new(55.0)) {
+		t.Fatal("imported boundary did not replace the file border")
+	}
+	if len(files) != 1 || string(files["AAA"]) == string(imported["AAA"]) {
+		t.Fatal("build changed its inputs")
+	}
+	if empty, err := BuildLocalBorders(nil, nil); err != nil || empty != nil {
+		t.Fatal(empty, err)
+	}
 	for _, bad := range []string{`not json`, `{"type":"Feature","geometry":null}`, `{"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[179,10],[-179,10],[-179,20],[179,20],[179,10]]]}}`} {
 		if err := os.WriteFile(border, []byte(bad), 0600); err != nil {
 			t.Fatal(err)
diff --git a/internal/config/meshmapper.go b/internal/config/meshmapper.go
index 5f36774..31bec78 100644
--- a/internal/config/meshmapper.go
+++ b/internal/config/meshmapper.go
@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"net/url"
 	"regexp"
+	"slices"
 	"time"
 )
 
@@ -15,6 +16,30 @@ const MaxScopeSources = 16
 
 type MeshMapperConfig struct {
 	Scopes MeshMapperScopesConfig `yaml:"scopes"`
+	Zones  MeshMapperZonesConfig  `yaml:"zones"`
+}
+
+// MeshMapperZonesConfig imports each region IATA's published boundary, overriding borderFile.
+type MeshMapperZonesConfig struct {
+	Enabled         bool     `yaml:"enabled"`
+	RefreshInterval duration `yaml:"refresh_interval"`
+}
+
+func (c MeshMapperZonesConfig) Interval() time.Duration {
+	if c.RefreshInterval.Duration == 0 {
+		return 24 * time.Hour
+	}
+	return c.RefreshInterval.Duration
+}
+
+// RegionIATAs returns the sorted, unique IATAs of every configured region.
+func (c *Config) RegionIATAs() []string {
+	var iatas []string
+	for _, region := range c.Regions {
+		iatas = append(iatas, region.IATAs...)
+	}
+	slices.Sort(iatas)
+	return slices.Compact(iatas)
 }
 
 // MeshMapperScopesConfig augments, but never replaces, the manual scopes list.
@@ -34,6 +59,15 @@ func (c MeshMapperScopesConfig) Interval() time.Duration {
 var meshMapperHost = regexp.MustCompile(`^[a-z0-9][a-z0-9-]*\.meshmapper\.net$`)
 
 func (c *Config) validateMeshMapper() error {
+	if z := c.MeshMapper.Zones; z.Enabled {
+		// The Zones API asks clients not to poll more than once an hour.
+		if z.Interval() < time.Hour || z.Interval() > 7*24*time.Hour {
+			return fmt.Errorf("meshmapper.zones.refresh_interval must be between 1h and 168h")
+		}
+		if len(c.RegionIATAs()) == 0 {
+			return fmt.Errorf("meshmapper.zones needs at least one configured region IATA")
+		}
+	}
 	s := c.MeshMapper.Scopes
 	if !s.Enabled {
 		return nil
diff --git a/internal/config/meshmapper_test.go b/internal/config/meshmapper_test.go
index 56a5634..d4e343b 100644
--- a/internal/config/meshmapper_test.go
+++ b/internal/config/meshmapper_test.go
@@ -47,3 +47,37 @@ func TestMeshMapperConfig(t *testing.T) {
 		t.Fatal("empty sources accepted")
 	}
 }
+
+func TestMeshMapperZonesConfig(t *testing.T) {
+	valid := "regions:\n  - slug: ottawa\n    iatas: [YOW, YOW]\n  - slug: toronto\n    iatas: [YYZ]\nmeshmapper:\n  zones:\n    enabled: true\n"
+	for _, tc := range []struct {
+		name, text string
+		bad        bool
+		interval   time.Duration
+	}{
+		{"default", valid, false, 24 * time.Hour},
+		{"hourly", valid + "    refresh_interval: 1h\n", false, time.Hour},
+		{"too often", valid + "    refresh_interval: 59m\n", true, 0},
+		{"too rare", valid + "    refresh_interval: 169h\n", true, 0},
+		{"no regions", "meshmapper:\n  zones:\n    enabled: true\n", true, 0},
+		{"disabled", "meshmapper:\n  zones:\n    enabled: false\n", false, 24 * time.Hour},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			p := filepath.Join(t.TempDir(), "config.yaml")
+			if err := os.WriteFile(p, []byte(tc.text), 0600); err != nil {
+				t.Fatal(err)
+			}
+			cfg, err := Load(p)
+			if (err != nil) != tc.bad {
+				t.Fatalf("error=%v", err)
+			}
+			if err == nil && cfg.MeshMapper.Zones.Interval() != tc.interval {
+				t.Fatal(cfg.MeshMapper.Zones.Interval())
+			}
+		})
+	}
+	cfg := &Config{Regions: []RegionConfig{{IATAs: []string{"YYZ", "YOW"}}, {IATAs: []string{"YOW"}}}}
+	if got := strings.Join(cfg.RegionIATAs(), ","); got != "YOW,YYZ" {
+		t.Fatal(got)
+	}
+}
diff --git a/internal/ingest/foreign_nodes_test.go b/internal/ingest/foreign_nodes_test.go
index 20a3f78..85f4fee 100644
--- a/internal/ingest/foreign_nodes_test.go
+++ b/internal/ingest/foreign_nodes_test.go
@@ -48,7 +48,7 @@ func TestForeignNodeUpdates(t *testing.T) {
 		t.Run(tc.name, func(t *testing.T) {
 			w.cfg.LocalBorders = nil
 			if tc.enabled {
-				w.cfg.LocalBorders = local
+				w.cfg.LocalBorders = borders.NewLive(local)
 			}
 			data := []byte{tc.role}
 			if tc.position {
diff --git a/internal/ingest/ingest.go b/internal/ingest/ingest.go
index dcbe2bb..523a1fb 100644
--- a/internal/ingest/ingest.go
+++ b/internal/ingest/ingest.go
@@ -58,8 +58,8 @@ import (
 
 // Config holds the connection parameters for one broker.
 type Config struct {
-	// LocalBorders is the same immutable classifier used by node API reads.
-	LocalBorders *borders.Local
+	// LocalBorders is the same live classifier used by node API reads.
+	LocalBorders *borders.Live
 	// BrokerName is a short human-readable label ("mqtt1", "mqtt2") used in
 	// log messages and stored in packet_observations.source_broker.
 	BrokerName string
diff --git a/internal/meshmapper/scopes.go b/internal/meshmapper/scopes.go
index 5eb0d7b..ac389a1 100644
--- a/internal/meshmapper/scopes.go
+++ b/internal/meshmapper/scopes.go
@@ -1,7 +1,7 @@
 // Copyright 2026 Beacon Contributors
 // SPDX-License-Identifier: AGPL-3.0-or-later
 
-// Package meshmapper imports the published regional scope catalogue, off the ingest path.
+// Package meshmapper imports published regional scope catalogues and boundaries, off the ingest path.
 package meshmapper
 
 import (
diff --git a/internal/meshmapper/zones.go b/internal/meshmapper/zones.go
new file mode 100644
index 0000000..2d86661
--- /dev/null
+++ b/internal/meshmapper/zones.go
@@ -0,0 +1,443 @@
+// Copyright 2026 Beacon Contributors
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+package meshmapper
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"log/slog"
+	"net/http"
+	"net/url"
+	"regexp"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/MeshCore-Beacon/beacon-server/internal/config"
+	"github.com/MeshCore-Beacon/beacon-server/internal/iatadb"
+)
+
+const (
+	ZonesURL        = "https://meshmapper.net/get_zones.php"
+	MaxZoneList     = 1 << 20
+	MaxBoundaryBody = 8 << 20 // outlines are never simplified
+
+	zoneListFresh    = time.Hour // the API's own cache lifetime
+	zoneFailureRetry = time.Hour // fair use: no more than one poll an hour
+)
+
+var zoneSite = regexp.MustCompile(`^[a-z0-9][a-z0-9-]*\.meshmapper\.net$`)
+
+// Boundary is one IATA's imported MeshMapper outline and its fetch state.
+type Boundary struct {
+	IATA, URL                           string
+	Feature                             json.RawMessage
+	ETag                                string
+	CheckedAt, AttemptedAt, NextAttempt time.Time
+	LastError                           string
+}
+
+type ZoneStore interface {
+	PruneZoneBoundaries(ctx context.Context, keep []string) ([]string, error)
+	ListZoneBoundaries(ctx context.Context) ([]Boundary, error)
+	SaveZoneBoundary(ctx context.Context, b Boundary) error
+}
+
+type zoneRegion struct {
+	country string
+	b       Boundary
+}
+
+type zoneEntry struct {
+	url         string
+	hasBoundary bool
+}
+
+type zoneList struct {
+	zones                  map[string]zoneEntry
+	etag                   string
+	fetchedAt, nextAttempt time.Time
+}
+
+// Zones is owned by one background task; listeners are wired before Restore.
+type Zones struct {
+	store      ZoneStore
+	enabled    bool
+	iatas      []string
+	interval   time.Duration
+	client     *http.Client
+	listURL    string
+	boundsURL  func(site string) (string, bool)
+	regions    []*zoneRegion
+	lists      map[string]*zoneList
+	retryAfter time.Time
+	onChange   func(ctx context.Context, iata string)
+	onUpdate   func(imported map[string]json.RawMessage)
+}
+
+func NewZones(cfg config.MeshMapperZonesConfig, iatas []string, store ZoneStore) *Zones {
+	return &Zones{store: store, enabled: cfg.Enabled, iatas: iatas, interval: cfg.Interval(), listURL: ZonesURL,
+		boundsURL: boundaryEndpoint, lists: map[string]*zoneList{}, client: &http.Client{
+			Timeout:       30 * time.Second,
+			CheckRedirect: func(*http.Request, []*http.Request) error { return http.ErrUseLastResponse },
+		}}
+}
+
+// OnChange receives each IATA whose served border changed, for cache invalidation.
+func (z *Zones) OnChange(fn func(ctx context.Context, iata string)) { z.onChange = fn }
+
+// OnUpdate receives every imported boundary whenever the set changes.
+func (z *Zones) OnUpdate(fn func(imported map[string]json.RawMessage)) { z.onUpdate = fn }
+
+// Restore prunes imports for unconfigured IATAs (all of them when disabled) and
+// loads saved boundaries, without making HTTP requests.
+func (z *Zones) Restore(ctx context.Context) error {
+	keep := []string{}
+	if z.enabled {
+		keep = z.iatas
+	}
+	pruned, err := z.store.PruneZoneBoundaries(ctx, keep)
+	if err != nil {
+		return fmt.Errorf("prune MeshMapper boundaries: %w", err)
+	}
+	for _, iata := range pruned {
+		slog.Info("MeshMapper boundary removed", "component", "meshmapper.zones", "iata", iata)
+		z.changed(ctx, iata)
+	}
+	if !z.enabled {
+		return nil
+	}
+	saved, err := z.store.ListZoneBoundaries(ctx)
+	if err != nil {
+		return fmt.Errorf("restore MeshMapper boundaries: %w", err)
+	}
+	byIATA := map[string]Boundary{}
+	for _, b := range saved {
+		byIATA[b.IATA] = b
+	}
+	for _, iata := range z.iatas {
+		country := iatadb.CountryFor(iata)
+		if country == "" {
+			slog.Warn("MeshMapper boundary skipped: IATA has no known country", "component", "meshmapper.zones", "iata", iata)
+			continue
+		}
+		b, ok := byIATA[iata]
+		if !ok {
+			b = Boundary{IATA: iata}
+		}
+		if b.LastError == "HTTP 429" && b.NextAttempt.After(z.retryAfter) {
+			z.retryAfter = b.NextAttempt
+		}
+		z.regions = append(z.regions, &zoneRegion{country: country, b: b})
+		z.log(b, "restored")
+	}
+	z.publish()
+	return nil
+}
+
+// Refresh makes at most one request. The scheduler serializes calls every 15s.
+func (z *Zones) Refresh(ctx context.Context) (err error) {
+	parent := ctx
+	defer func() {
+		if parent.Err() != nil {
+			err = nil
+		}
+	}()
+	ctx, cancel := context.WithTimeout(ctx, time.Minute)
+	defer cancel()
+	now := time.Now().UTC()
+	if now.Before(z.retryAfter) {
+		return nil
+	}
+	for _, r := range z.regions {
+		if now.Before(r.b.NextAttempt) {
+			continue
+		}
+		list := z.lists[r.country]
+		if list == nil || now.Sub(list.fetchedAt) >= zoneListFresh {
+			if list != nil && now.Before(list.nextAttempt) {
+				continue
+			}
+			return z.fetchList(ctx, r.country, now)
+		}
+		return z.refresh(ctx, r, list, now)
+	}
+	return nil
+}
+
+func (z *Zones) fetchList(ctx context.Context, country string, now time.Time) error {
+	list := z.lists[country]
+	if list == nil {
+		list = &zoneList{}
+		z.lists[country] = list
+	}
+	endpoint := z.listURL + "?country=" + url.QueryEscape(country)
+	etag := ""
+	if list.zones != nil {
+		etag = list.etag
+	}
+	status, body, header, err := z.get(ctx, endpoint, etag, MaxZoneList)
+	if err != nil {
+		return err
+	}
+	problem := ""
+	switch status {
+	case http.StatusOK:
+		zones, decodeErr := decodeZones(body, country)
+		if decodeErr != nil {
+			problem = "invalid response"
+		} else {
+			list.zones, list.etag = zones, header.Get("ETag")
+		}
+	case http.StatusNotModified:
+		if list.zones == nil {
+			problem = "304 without cached list"
+		}
+	default:
+		problem = z.statusProblem(status, header, now, &list.nextAttempt)
+	}
+	if problem == "" {
+		list.fetchedAt = now
+	} else if list.nextAttempt.Before(now.Add(zoneFailureRetry)) {
+		list.nextAttempt = now.Add(zoneFailureRetry)
+	}
+	level := slog.LevelInfo
+	if problem != "" {
+		level = slog.LevelWarn
+	}
+	slog.Log(ctx, level, "MeshMapper zone list checked", "component", "meshmapper.zones", "country", country,
+		"zones", len(list.zones), "last_error", problem)
+	return nil
+}
+
+func (z *Zones) refresh(ctx context.Context, r *zoneRegion, list *zoneList, now time.Time) error {
+	update := Boundary{IATA: r.b.IATA, URL: r.b.URL, AttemptedAt: now, NextAttempt: now.Add(z.interval)}
+	var retryAt time.Time
+	entry, listed := list.zones[r.b.IATA]
+	endpoint, valid := "", false
+	if listed {
+		update.URL = entry.url
+		endpoint, valid = z.boundsURL(entry.url)
+	}
+	switch {
+	case !listed:
+		update.LastError = "not listed"
+	case !entry.hasBoundary:
+		update.LastError = "no boundary"
+	case !valid:
+		update.LastError = "invalid site URL"
+	default:
+		etag := ""
+		if r.b.Feature != nil {
+			etag = r.b.ETag
+		}
+		status, body, header, err := z.get(ctx, endpoint, etag, MaxBoundaryBody)
+		if err != nil {
+			return err
+		}
+		switch status {
+		case http.StatusOK:
+			feature, decodeErr := decodeBoundary(body, r.b.IATA)
+			switch {
+			case decodeErr != nil:
+				update.LastError = "invalid response" // includes truncated bodies; retry
+			case feature == nil:
+				update.LastError = "no boundary"
+			default:
+				update.Feature = feature
+			}
+		case http.StatusNotModified:
+			if r.b.Feature == nil {
+				update.LastError = "304 without cached boundary"
+			}
+		default:
+			update.LastError = z.statusProblem(status, header, now, &retryAt)
+		}
+		if update.LastError == "" {
+			etag := header.Get("ETag")
+			if len(etag) > 256 || strings.ContainsAny(etag, "\r\n") {
+				update.LastError, update.Feature = "invalid ETag", nil
+			} else {
+				if status == http.StatusNotModified && etag == "" {
+					etag = r.b.ETag
+				}
+				update.ETag, update.CheckedAt = etag, now
+			}
+		}
+		if update.LastError != "" && update.LastError != "no boundary" {
+			update.NextAttempt = now.Add(min(z.interval, zoneFailureRetry))
+			if retryAt.After(update.NextAttempt) {
+				update.NextAttempt = retryAt
+			}
+		}
+	}
+	if err := z.store.SaveZoneBoundary(ctx, update); err != nil {
+		r.b.NextAttempt = update.NextAttempt // avoid retrying every tick during a DB outage
+		return fmt.Errorf("persist MeshMapper boundary %s: %w", r.b.IATA, err)
+	}
+	changed := update.Feature != nil && !bytes.Equal(update.Feature, r.b.Feature)
+	if update.Feature != nil {
+		r.b.Feature = update.Feature
+	}
+	if !update.CheckedAt.IsZero() {
+		r.b.CheckedAt, r.b.ETag = update.CheckedAt, update.ETag
+	}
+	r.b.URL, r.b.AttemptedAt, r.b.NextAttempt, r.b.LastError = update.URL, now, update.NextAttempt, update.LastError
+	if changed {
+		z.changed(ctx, r.b.IATA)
+		z.publish()
+	}
+	z.log(r.b, "checked")
+	return nil
+}
+
+// get returns transport errors only when ctx ended; other failures become status 0.
+func (z *Zones) get(ctx context.Context, endpoint, etag string, limit int64) (int, []byte, http.Header, error) {
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint, nil)
+	if err != nil {
+		return 0, nil, nil, err
+	}
+	request.Header.Set("Accept", "application/json")
+	request.Header.Set("User-Agent", "Beacon-MeshMapper-Zones/1")
+	if etag != "" {
+		request.Header.Set("If-None-Match", etag)
+	}
+	response, err := z.client.Do(request)
+	if err != nil {
+		if ctx.Err() != nil {
+			return 0, nil, nil, ctx.Err()
+		}
+		return 0, nil, http.Header{}, nil
+	}
+	defer response.Body.Close()
+	if response.StatusCode != http.StatusOK {
+		return response.StatusCode, nil, response.Header, nil
+	}
+	body, err := io.ReadAll(io.LimitReader(response.Body, limit+1))
+	if err != nil || int64(len(body)) > limit {
+		return response.StatusCode, nil, response.Header, nil
+	}
+	return response.StatusCode, body, response.Header, nil
+}
+
+// statusProblem describes a failed response and honours Retry-After on 429/503.
+func (z *Zones) statusProblem(status int, header http.Header, now time.Time, retryAt *time.Time) string {
+	if status == 0 {
+		return "request failed" // don't persist untrusted error text
+	}
+	if status == http.StatusTooManyRequests || status == http.StatusServiceUnavailable {
+		if seconds, err := strconv.ParseInt(header.Get("Retry-After"), 10, 64); err == nil && seconds > 0 && seconds <= int64((1<<63-1)/time.Second) {
+			*retryAt = now.Add(time.Duration(seconds) * time.Second)
+		}
+		// The rate limit is shared by both endpoints, so pause every request.
+		if status == http.StatusTooManyRequests {
+			z.retryAfter = *retryAt
+			if retryAt.IsZero() {
+				z.retryAfter = now.Add(time.Minute)
+			}
+		}
+	}
+	return fmt.Sprintf("HTTP %d", status)
+}
+
+func (z *Zones) changed(ctx context.Context, iata string) {
+	if z.onChange != nil {
+		z.onChange(ctx, iata)
+	}
+}
+
+func (z *Zones) publish() {
+	if z.onUpdate == nil {
+		return
+	}
+	imported := map[string]json.RawMessage{}
+	for _, r := range z.regions {
+		if r.b.Feature != nil {
+			imported[r.b.IATA] = r.b.Feature
+		}
+	}
+	z.onUpdate(imported)
+}
+
+func (z *Zones) log(b Boundary, action string) {
+	level := slog.LevelInfo
+	if b.LastError != "" && b.LastError != "no boundary" && b.LastError != "not listed" {
+		level = slog.LevelWarn
+	}
+	slog.Log(context.Background(), level, "MeshMapper boundary "+action, "component", "meshmapper.zones", "iata", b.IATA,
+		"source", b.URL, "imported", b.Feature != nil, "checked_at", b.CheckedAt, "next_attempt", b.NextAttempt, "last_error", b.LastError)
+}
+
+// boundaryEndpoint accepts only a published region site root.
+func boundaryEndpoint(site string) (string, bool) {
+	u, err := url.Parse(site)
+	if err != nil || u.Scheme != "https" || u.User != nil || !zoneSite.MatchString(u.Host) ||
+		(u.Path != "" && u.Path != "/") || u.RawQuery != "" || u.ForceQuery || u.Fragment != "" {
+		return "", false
+	}
+	return "https://" + u.Host + "/get_geojson.php", true
+}
+
+func decodeZones(body []byte, country string) (map[string]zoneEntry, error) {
+	var document struct {
+		Country string `json:"country"`
+		Zones   *[]struct {
+			Code        string `json:"code"`
+			URL         string `json:"url"`
+			HasBoundary bool   `json:"has_boundary"`
+		} `json:"zones"`
+	}
+	if err := json.Unmarshal(body, &document); err != nil {
+		return nil, err
+	}
+	if !strings.EqualFold(document.Country, country) || document.Zones == nil {
+		return nil, fmt.Errorf("invalid zone list")
+	}
+	zones := make(map[string]zoneEntry, len(*document.Zones))
+	for _, zone := range *document.Zones {
+		zones[strings.ToUpper(zone.Code)] = zoneEntry{url: zone.URL, hasBoundary: zone.HasBoundary}
+	}
+	return zones, nil
+}
+
+// decodeBoundary returns nil when MeshMapper has no usable outline for the region.
+func decodeBoundary(body []byte, iata string) (json.RawMessage, error) {
+	var collection struct {
+		Type     string            `json:"type"`
+		Features []json.RawMessage `json:"features"`
+	}
+	if err := json.Unmarshal(body, &collection); err != nil {
+		return nil, err
+	}
+	if collection.Type != "FeatureCollection" || len(collection.Features) != 1 {
+		return nil, fmt.Errorf("expected one region feature")
+	}
+	var feature struct {
+		Geometry   json.RawMessage `json:"geometry"`
+		Properties struct {
+			Code string `json:"code"`
+		} `json:"properties"`
+	}
+	if err := json.Unmarshal(collection.Features[0], &feature); err != nil {
+		return nil, err
+	}
+	if !strings.EqualFold(feature.Properties.Code, iata) {
+		return nil, fmt.Errorf("feature is for another region")
+	}
+	if len(feature.Geometry) == 0 || string(feature.Geometry) == "null" {
+		return nil, nil
+	}
+	validated, err := config.ValidateBorder(collection.Features[0])
+	if err != nil {
+		return nil, err
+	}
+	// Foreign marking must accept anything the map serves.
+	if _, err := config.BuildLocalBorders(nil, map[string]json.RawMessage{iata: validated}); err != nil {
+		return nil, err
+	}
+	return validated, nil
+}
diff --git a/internal/meshmapper/zones_test.go b/internal/meshmapper/zones_test.go
new file mode 100644
index 0000000..af62cc8
--- /dev/null
+++ b/internal/meshmapper/zones_test.go
@@ -0,0 +1,331 @@
+// Copyright 2026 Beacon Contributors
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+package meshmapper
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"net/http/httptest"
+	"slices"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/MeshCore-Beacon/beacon-server/internal/config"
+)
+
+const square = `{"type":"Polygon","coordinates":[[[-76,45],[-75,45],[-75,46],[-76,46],[-76,45]]]}`
+
+func boundaryBody(code, geometry string) string {
+	return `{"type":"FeatureCollection","generated_at":"2026-09-25T15:00:00Z","features":[{"type":"Feature","geometry":` + geometry +
+		`,"properties":{"code":"` + code + `","name":"Ottawa, CA","center":[-75.7,45.4],"radius_km":42,"has_boundary":true}}]}`
+}
+
+type zoneMemoryStore struct {
+	rows   map[string]Boundary
+	pruned []string
+	fail   bool
+}
+
+func (s *zoneMemoryStore) PruneZoneBoundaries(_ context.Context, keep []string) ([]string, error) {
+	var removed []string
+	for iata := range s.rows {
+		if !slices.Contains(keep, iata) {
+			delete(s.rows, iata)
+			removed = append(removed, iata)
+		}
+	}
+	s.pruned = removed
+	return removed, nil
+}
+
+func (s *zoneMemoryStore) ListZoneBoundaries(context.Context) ([]Boundary, error) {
+	var out []Boundary
+	for _, b := range s.rows {
+		out = append(out, b)
+	}
+	return out, nil
+}
+
+func (s *zoneMemoryStore) SaveZoneBoundary(_ context.Context, b Boundary) error {
+	if s.fail {
+		return errors.New("offline")
+	}
+	old := s.rows[b.IATA]
+	if b.Feature == nil {
+		b.Feature = old.Feature
+	}
+	if b.CheckedAt.IsZero() {
+		b.CheckedAt, b.ETag = old.CheckedAt, old.ETag
+	}
+	s.rows[b.IATA] = b
+	return nil
+}
+
+type fakeMeshMapper struct {
+	*httptest.Server
+	list, boundary     string
+	listStatus, status int
+	etag, retryAfter   string
+	listCalls, calls   int
+	ifNoneMatch        []string
+}
+
+func newFakeMeshMapper(t *testing.T) *fakeMeshMapper {
+	f := &fakeMeshMapper{listStatus: 200, status: 200, etag: `"v1"`, boundary: boundaryBody("YOW", square)}
+	f.Server = httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.URL.Path {
+		case "/get_zones.php":
+			f.listCalls++
+			if r.URL.Query().Get("country") != "CA" {
+				t.Errorf("country query: %s", r.URL.RawQuery)
+			}
+			w.WriteHeader(f.listStatus)
+			_, _ = w.Write([]byte(f.list))
+		case "/get_geojson.php":
+			f.calls++
+			f.ifNoneMatch = append(f.ifNoneMatch, r.Header.Get("If-None-Match"))
+			w.Header().Set("ETag", f.etag)
+			w.Header().Set("Retry-After", f.retryAfter)
+			w.WriteHeader(f.status)
+			if f.status == 200 {
+				_, _ = w.Write([]byte(f.boundary))
+			}
+		default:
+			t.Errorf("unexpected path %s", r.URL.Path)
+		}
+	}))
+	f.list = `{"country":"CA","count":1,"zones":[{"code":"YOW","url":"` + f.URL + `/","has_boundary":true,"group":null}],"groups":[]}`
+	t.Cleanup(f.Close)
+	return f
+}
+
+type zoneHarness struct {
+	z        *Zones
+	store    *zoneMemoryStore
+	changed  []string
+	imported map[string]json.RawMessage
+}
+
+func newZoneHarness(t *testing.T, f *fakeMeshMapper, store *zoneMemoryStore, enabled bool) *zoneHarness {
+	t.Helper()
+	h := &zoneHarness{store: store}
+	h.z = NewZones(config.MeshMapperZonesConfig{Enabled: enabled}, []string{"YOW"}, store)
+	h.z.listURL = f.URL + "/get_zones.php"
+	h.z.boundsURL = func(site string) (string, bool) { return site + "get_geojson.php", strings.HasPrefix(site, f.URL) }
+	h.z.OnChange(func(_ context.Context, iata string) { h.changed = append(h.changed, iata) })
+	h.z.OnUpdate(func(imported map[string]json.RawMessage) { h.imported = imported })
+	if err := h.z.Restore(context.Background()); err != nil {
+		t.Fatal(err)
+	}
+	return h
+}
+
+// tick forces the region due and runs refreshes until the boundary request is made.
+func (h *zoneHarness) tick(t *testing.T) Boundary {
+	t.Helper()
+	h.z.regions[0].b.NextAttempt = time.Time{}
+	for range 2 {
+		if err := h.z.Refresh(context.Background()); err != nil {
+			t.Fatal(err)
+		}
+	}
+	return h.store.rows["YOW"]
+}
+
+func TestZonesImportAndConditionalRefresh(t *testing.T) {
+	f := newFakeMeshMapper(t)
+	h := newZoneHarness(t, f, &zoneMemoryStore{rows: map[string]Boundary{}}, true)
+	b := h.tick(t)
+	if f.listCalls != 1 || f.calls != 1 || b.Feature == nil || b.ETag != `"v1"` || b.LastError != "" || b.URL != f.URL+"/" {
+		t.Fatalf("import failed: %+v list=%d calls=%d", b, f.listCalls, f.calls)
+	}
+	if !slices.Equal(h.changed, []string{"YOW"}) || h.imported["YOW"] == nil {
+		t.Fatal("listeners not told", h.changed, h.imported)
+	}
+	if !strings.Contains(string(b.Feature), `"bbox"`) || !strings.Contains(string(b.Feature), `"code":"YOW"`) {
+		t.Fatal("feature not validated with bbox and properties", string(b.Feature))
+	}
+	if got := b.NextAttempt.Sub(b.AttemptedAt); got != 24*time.Hour {
+		t.Fatal("refresh interval", got)
+	}
+
+	f.status = 304
+	b = h.tick(t)
+	if f.listCalls != 1 || f.ifNoneMatch[1] != `"v1"` || b.Feature == nil || b.LastError != "" || len(h.changed) != 1 {
+		t.Fatalf("304 mishandled: %+v list=%d changed=%v", b, f.listCalls, h.changed)
+	}
+
+	f.status, f.etag = 200, `"v2"`
+	f.boundary = boundaryBody("YOW", `{"type":"Polygon","coordinates":[[[-77,45],[-75,45],[-75,46],[-77,46],[-77,45]]]}`)
+	b = h.tick(t)
+	if b.ETag != `"v2"` || len(h.changed) != 2 || !strings.Contains(string(h.imported["YOW"]), "-77") {
+		t.Fatal("changed boundary not published", b.ETag, h.changed)
+	}
+}
+
+func TestZonesKeepLastGoodBoundary(t *testing.T) {
+	for _, tc := range []struct {
+		name, boundary string
+		status         int
+		wantErr        string
+		wantRetry      time.Duration
+	}{
+		{"null geometry", boundaryBody("YOW", "null"), 200, "no boundary", 24 * time.Hour},
+		{"not found", "", 404, "HTTP 404", time.Hour},
+		{"unavailable", "", 503, "HTTP 503", time.Hour},
+		{"truncated", boundaryBody("YOW", square)[:80], 200, "invalid response", time.Hour},
+		{"other region", boundaryBody("YVR", square), 200, "invalid response", time.Hour},
+		{"oversized", `{"type":"FeatureCollection","features":[],"pad":"` + strings.Repeat("x", MaxBoundaryBody) + `"}`, 200, "invalid response", time.Hour},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			f := newFakeMeshMapper(t)
+			h := newZoneHarness(t, f, &zoneMemoryStore{rows: map[string]Boundary{}}, true)
+			good := h.tick(t).Feature
+			f.status, f.boundary = tc.status, tc.boundary
+			b := h.tick(t)
+			if b.LastError != tc.wantErr || string(b.Feature) != string(good) || string(h.imported["YOW"]) != string(good) || len(h.changed) != 1 {
+				t.Fatalf("got %q, feature kept=%v", b.LastError, string(b.Feature) == string(good))
+			}
+			if got := b.NextAttempt.Sub(b.AttemptedAt); got != tc.wantRetry {
+				t.Fatal("retry", got)
+			}
+		})
+	}
+}
+
+func TestZonesSkipRegionsWithoutBoundary(t *testing.T) {
+	for _, tc := range []struct{ name, zones, want string }{
+		{"not listed", `[]`, "not listed"},
+		{"no boundary", `[{"code":"YOW","url":"URL/","has_boundary":false}]`, "no boundary"},
+		{"foreign site", `[{"code":"yow","url":"https://example.com/","has_boundary":true}]`, "invalid site URL"},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			f := newFakeMeshMapper(t)
+			f.list = `{"country":"CA","count":1,"zones":` + strings.ReplaceAll(tc.zones, "URL", f.URL) + `,"groups":[]}`
+			h := newZoneHarness(t, f, &zoneMemoryStore{rows: map[string]Boundary{}}, true)
+			b := h.tick(t)
+			if f.calls != 0 || b.LastError != tc.want || b.Feature != nil || len(h.changed) != 0 {
+				t.Fatalf("got %+v calls=%d", b, f.calls)
+			}
+			if got := b.NextAttempt.Sub(b.AttemptedAt); got != 24*time.Hour {
+				t.Fatal("authoritative answer retried early", got)
+			}
+		})
+	}
+}
+
+func TestZonesListFailureBacksOff(t *testing.T) {
+	f := newFakeMeshMapper(t)
+	f.listStatus = 500
+	h := newZoneHarness(t, f, &zoneMemoryStore{rows: map[string]Boundary{}}, true)
+	for range 3 {
+		if err := h.z.Refresh(context.Background()); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if f.listCalls != 1 || f.calls != 0 || len(h.store.rows) != 0 {
+		t.Fatal("failed list retried early", f.listCalls, f.calls)
+	}
+	f.listStatus, f.list = 200, `{"country":"US","zones":[]}`
+	h.z.lists["CA"].nextAttempt, h.z.lists["CA"].fetchedAt = time.Time{}, time.Time{}
+	_ = h.z.Refresh(context.Background())
+	if h.z.lists["CA"].zones != nil {
+		t.Fatal("list for another country accepted")
+	}
+}
+
+func TestZonesRateLimitPausesEveryRequest(t *testing.T) {
+	f := newFakeMeshMapper(t)
+	h := newZoneHarness(t, f, &zoneMemoryStore{rows: map[string]Boundary{}}, true)
+	f.status, f.retryAfter = 429, "120"
+	b := h.tick(t)
+	if b.LastError != "HTTP 429" || b.NextAttempt.Sub(b.AttemptedAt) != time.Hour || h.z.retryAfter.Sub(b.AttemptedAt) != 2*time.Minute {
+		t.Fatalf("429 not honoured: %+v retryAfter=%v", b, h.z.retryAfter)
+	}
+	h.z.regions[0].b.NextAttempt = time.Time{}
+	_ = h.z.Refresh(context.Background())
+	if f.calls != 1 {
+		t.Fatal("requested during Retry-After")
+	}
+	restarted := newZoneHarness(t, f, h.store, true)
+	if !restarted.z.retryAfter.Equal(b.NextAttempt) {
+		t.Fatal("persisted 429 not restored")
+	}
+}
+
+func TestZonesRestoreAndPrune(t *testing.T) {
+	f := newFakeMeshMapper(t)
+	store := &zoneMemoryStore{rows: map[string]Boundary{}}
+	first := newZoneHarness(t, f, store, true)
+	first.tick(t)
+	store.rows["OLD"] = Boundary{IATA: "OLD", Feature: json.RawMessage(`{}`)}
+
+	restarted := newZoneHarness(t, f, store, true)
+	if !slices.Equal(store.pruned, []string{"OLD"}) || !slices.Equal(restarted.changed, []string{"OLD"}) {
+		t.Fatal("unconfigured IATA not pruned", store.pruned, restarted.changed)
+	}
+	if restarted.imported["YOW"] == nil || f.calls != 1 {
+		t.Fatal("saved boundary not restored without a request")
+	}
+	if err := restarted.z.Refresh(context.Background()); err != nil || f.calls != 1 || f.listCalls != 1 {
+		t.Fatal("refreshed before due", err, f.calls)
+	}
+
+	disabled := newZoneHarness(t, f, store, false)
+	if len(store.rows) != 0 || !slices.Equal(disabled.changed, []string{"YOW"}) || len(disabled.z.regions) != 0 {
+		t.Fatal("disabling did not remove imports")
+	}
+}
+
+func TestZonesPersistFailureWaitsForNextAttempt(t *testing.T) {
+	f := newFakeMeshMapper(t)
+	h := newZoneHarness(t, f, &zoneMemoryStore{rows: map[string]Boundary{}, fail: true}, true)
+	h.z.regions[0].b.NextAttempt = time.Time{}
+	_ = h.z.Refresh(context.Background())
+	if err := h.z.Refresh(context.Background()); err == nil {
+		t.Fatal("persist error hidden")
+	}
+	if h.z.regions[0].b.NextAttempt.IsZero() || h.imported["YOW"] != nil || len(h.changed) != 0 {
+		t.Fatal("uncommitted boundary published")
+	}
+}
+
+func TestBoundaryEndpoint(t *testing.T) {
+	for site, want := range map[string]string{
+		"https://yow.meshmapper.net/":          "https://yow.meshmapper.net/get_geojson.php",
+		"https://yow.meshmapper.net":           "https://yow.meshmapper.net/get_geojson.php",
+		"http://yow.meshmapper.net/":           "",
+		"https://meshmapper.net.evil.com/":     "",
+		"https://user@yow.meshmapper.net/":     "",
+		"https://yow.meshmapper.net/x/":        "",
+		"https://yow.meshmapper.net/?a=b":      "",
+		"https://yow.meshmapper.net:8443/":     "",
+		"https://yow.meshmapper.net/#fragment": "",
+	} {
+		got, ok := boundaryEndpoint(site)
+		if got != want || ok != (want != "") {
+			t.Errorf("%s: %q %v", site, got, ok)
+		}
+	}
+}
+
+func TestDecodeBoundaryRejectsUnusableOutlines(t *testing.T) {
+	for name, body := range map[string]string{
+		"two features":  `{"type":"FeatureCollection","features":[{"type":"Feature","geometry":null,"properties":{"code":"YOW"}},{"type":"Feature","geometry":null,"properties":{"code":"YOW"}}]}`,
+		"not a polygon": boundaryBody("YOW", `{"type":"Point","coordinates":[-75,45]}`),
+		"open ring":     boundaryBody("YOW", `{"type":"Polygon","coordinates":[[[-76,45],[-75,45],[-75,46],[-76,46]]]}`),
+		"antimeridian":  boundaryBody("YOW", `{"type":"Polygon","coordinates":[[[179,10],[-179,10],[-179,20],[179,20],[179,10]]]}`),
+		"zero area":     boundaryBody("YOW", `{"type":"Polygon","coordinates":[[[-76,45],[-75,45],[-74,45],[-76,45]]]}`),
+	} {
+		if _, err := decodeBoundary([]byte(body), "YOW"); err == nil {
+			t.Errorf("%s accepted", name)
+		}
+	}
+	if feature, err := decodeBoundary([]byte(boundaryBody("yow", square)), "YOW"); err != nil || feature == nil {
+		t.Fatal("case-insensitive code rejected", err)
+	}
+}