diff --git a/superset-frontend/plugins/plugin-chart-country-map/src/plugin/controlPanel.tsx b/superset-frontend/plugins/plugin-chart-country-map/src/plugin/controlPanel.tsx
index 9105f3d9101..b33dc5d713d 100644
--- a/superset-frontend/plugins/plugin-chart-country-map/src/plugin/controlPanel.tsx
+++ b/superset-frontend/plugins/plugin-chart-country-map/src/plugin/controlPanel.tsx
@@ -25,6 +25,7 @@ import {
   getStandardizedControls,
 } from '@superset-ui/chart-controls';
 import manifest from '../data/manifest.json';
+import migrateFromLegacy from './migrateFromLegacy';
 
 // ----------------------------------------------------------------------
 // Choice tables — sourced from the build pipeline's manifest.json
@@ -96,9 +97,11 @@ const WORLDVIEW_CHOICES: Array<[string, string]> = M.worldviews.map(wv => [
   WORLDVIEW_LABELS[wv] || wv,
 ]);
 
+// Map scope choices. The underlying values stay 0/1/aggregated so saved
+// charts and form_data don't break — only the labels change for clarity.
 const ADMIN_LEVEL_CHOICES: Array<[string, string]> = [
-  [String(0), t('Countries (Admin 0)')],
-  [String(1), t('Subdivisions (Admin 1)')],
+  [String(0), t('World')],
+  [String(1), t('Country')],
   ['aggregated', t('Aggregated regions')],
 ];
 
@@ -316,10 +319,13 @@ const config: ControlPanelConfig = {
             name: 'admin_level',
             config: {
               type: 'SelectControl',
-              label: t('Admin level'),
+              label: t('Map view'),
               description: t(
-                'Choose the geographic level: countries (world map), ' +
-                  'subdivisions of one country, or an aggregated regional layer.',
+                'World shows all countries; Country shows subdivisions of ' +
+                  'one country (states/provinces/departments); Aggregated ' +
+                  "regions dissolves a country's subdivisions into coarser " +
+                  'administrative regions (e.g. French regions, Turkish ' +
+                  'NUTS-1 regions). Stored as admin_level (0 / 1 / aggregated).',
               ),
               choices: ADMIN_LEVEL_CHOICES,
               default: String(0),
@@ -528,11 +534,31 @@ const config: ControlPanelConfig = {
       renderTrigger: true,
     },
   },
-  formDataOverrides: formData => ({
-    ...formData,
-    entity: getStandardizedControls().shiftColumn(),
-    metric: getStandardizedControls().shiftMetric(),
-  }),
+  // formDataOverrides runs when the user switches a chart's viz_type to
+  // this plugin. We use it for two jobs:
+  //   1. Standard control hand-off (entity, metric) via getStandardizedControls
+  //   2. Migration from the legacy country_map plugin — translate the
+  //      legacy `select_country` value into admin_level / country /
+  //      composite / region_set so the new chart lands pre-populated
+  //      rather than dumping the user back to an empty Country dropdown.
+  formDataOverrides: formData => {
+    const fromLegacy =
+      typeof formData.select_country === 'string' && formData.select_country
+        ? migrateFromLegacy(formData)
+        : {};
+    return {
+      ...formData,
+      entity: getStandardizedControls().shiftColumn(),
+      metric: getStandardizedControls().shiftMetric(),
+      // Only fill fields the user has not already set on the new chart;
+      // explicit user edits on the new viz win over legacy migration.
+      ...Object.fromEntries(
+        Object.entries(fromLegacy).filter(
+          ([k]) => formData[k as keyof typeof formData] == null,
+        ),
+      ),
+    };
+  },
 };
 
 export default config;
diff --git a/superset-frontend/plugins/plugin-chart-country-map/src/plugin/migrateFromLegacy.ts b/superset-frontend/plugins/plugin-chart-country-map/src/plugin/migrateFromLegacy.ts
new file mode 100644
index 00000000000..4088204c0ae
--- /dev/null
+++ b/superset-frontend/plugins/plugin-chart-country-map/src/plugin/migrateFromLegacy.ts
@@ -0,0 +1,308 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+/**
+ * Translate a legacy `country_map` chart's form_data into the new
+ * `country_map_v2` form_data shape.
+ *
+ * Triggered from controlPanel.formDataOverrides whenever a user switches
+ * a saved chart's viz type to country_map_v2. We try to preserve as much
+ * intent as possible:
+ *
+ *   - Legacy `select_country: 'france'` → admin_level=1, country='FRA'
+ *   - Legacy `select_country: 'france_overseas'` → composite='france_overseas'
+ *   - Legacy `select_country: 'turkey_regions'`  → admin_level='aggregated',
+ *                                                   country='TUR', region_set='nuts_1'
+ *   - Legacy `select_country: 'italy_regions'`   → ITA/regions
+ *   - Legacy `select_country: 'philippines_regions'` → PHL/regions
+ *   - Legacy `select_country: 'france_regions'`  → FRA/regions
+ *
+ * Worldview defaults to 'ukr' (the new plugin's default editorial choice).
+ * Standard controls (entity, metric, color scheme, number format) flow
+ * through the standard `formDataOverrides` path; this migration only
+ * touches the country/admin/composite/region_set quartet.
+ */
+
+interface PartialFormData {
+  select_country?: string;
+  [k: string]: unknown;
+}
+
+interface MigrationOutput {
+  admin_level?: string;
+  country?: string;
+  composite?: string;
+  region_set?: string;
+  worldview?: string;
+}
+
+// Composite outputs — legacy keys that should map to the new plugin's
+// composite_maps.yaml-driven composite control rather than to a country.
+const LEGACY_TO_COMPOSITE: Record<string, string> = {
+  france_overseas: 'france_overseas',
+};
+
+// Aggregated region outputs — legacy keys that should map to the new
+// plugin's regional_aggregations.yaml-driven country+region_set pair.
+const LEGACY_TO_AGGREGATED: Record<
+  string,
+  { country: string; region_set: string }
+> = {
+  france_regions: { country: 'FRA', region_set: 'regions' },
+  italy_regions: { country: 'ITA', region_set: 'regions' },
+  philippines_regions: { country: 'PHL', region_set: 'regions' },
+  turkey_regions: { country: 'TUR', region_set: 'nuts_1' },
+};
+
+// Per-country subdivisions — legacy snake_case keys mapped to ISO 3166-1
+// alpha-3 codes used by the new plugin's country control. Coverage is
+// intentionally broad — every legacy country file maps to a sibling
+// entry in the new build's admin 1 outputs.
+const LEGACY_TO_ISO_A3: Record<string, string> = {
+  afghanistan: 'AFG',
+  aland: 'ALD',
+  albania: 'ALB',
+  algeria: 'DZA',
+  american_samoa: 'ASM',
+  andorra: 'AND',
+  angola: 'AGO',
+  anguilla: 'AIA',
+  antarctica: 'ATA',
+  antigua_and_barbuda: 'ATG',
+  argentina: 'ARG',
+  armenia: 'ARM',
+  australia: 'AUS',
+  austria: 'AUT',
+  azerbaijan: 'AZE',
+  bahrain: 'BHR',
+  bangladesh: 'BGD',
+  barbados: 'BRB',
+  belarus: 'BLR',
+  belgium: 'BEL',
+  belize: 'BLZ',
+  benin: 'BEN',
+  bermuda: 'BMU',
+  bhutan: 'BTN',
+  bolivia: 'BOL',
+  bosnia_and_herzegovina: 'BIH',
+  botswana: 'BWA',
+  brazil: 'BRA',
+  brunei: 'BRN',
+  bulgaria: 'BGR',
+  burkina_faso: 'BFA',
+  burundi: 'BDI',
+  cambodia: 'KHM',
+  cameroon: 'CMR',
+  canada: 'CAN',
+  cape_verde: 'CPV',
+  central_african_republic: 'CAF',
+  chad: 'TCD',
+  chile: 'CHL',
+  china: 'CHN',
+  colombia: 'COL',
+  comoros: 'COM',
+  cook_islands: 'COK',
+  costa_rica: 'CRI',
+  croatia: 'HRV',
+  cuba: 'CUB',
+  cyprus: 'CYP',
+  czech_republic: 'CZE',
+  democratic_republic_of_the_congo: 'COD',
+  denmark: 'DNK',
+  djibouti: 'DJI',
+  dominica: 'DMA',
+  dominican_republic: 'DOM',
+  ecuador: 'ECU',
+  egypt: 'EGY',
+  el_salvador: 'SLV',
+  equatorial_guinea: 'GNQ',
+  eritrea: 'ERI',
+  estonia: 'EST',
+  ethiopia: 'ETH',
+  fiji: 'FJI',
+  finland: 'FIN',
+  france: 'FRA',
+  french_polynesia: 'PYF',
+  gabon: 'GAB',
+  gambia: 'GMB',
+  germany: 'DEU',
+  ghana: 'GHA',
+  greece: 'GRC',
+  greenland: 'GRL',
+  grenada: 'GRD',
+  guatemala: 'GTM',
+  guinea: 'GIN',
+  guyana: 'GUY',
+  haiti: 'HTI',
+  honduras: 'HND',
+  hungary: 'HUN',
+  iceland: 'ISL',
+  india: 'IND',
+  indonesia: 'IDN',
+  iran: 'IRN',
+  israel: 'ISR',
+  italy: 'ITA',
+  ivory_coast: 'CIV',
+  japan: 'JPN',
+  jordan: 'JOR',
+  kazakhstan: 'KAZ',
+  kenya: 'KEN',
+  korea: 'KOR',
+  kuwait: 'KWT',
+  kyrgyzstan: 'KGZ',
+  laos: 'LAO',
+  latvia: 'LVA',
+  lebanon: 'LBN',
+  lesotho: 'LSO',
+  liberia: 'LBR',
+  libya: 'LBY',
+  liechtenstein: 'LIE',
+  lithuania: 'LTU',
+  luxembourg: 'LUX',
+  macedonia: 'MKD',
+  madagascar: 'MDG',
+  malawi: 'MWI',
+  malaysia: 'MYS',
+  maldives: 'MDV',
+  mali: 'MLI',
+  malta: 'MLT',
+  marshall_islands: 'MHL',
+  mauritania: 'MRT',
+  mauritius: 'MUS',
+  mexico: 'MEX',
+  moldova: 'MDA',
+  mongolia: 'MNG',
+  montenegro: 'MNE',
+  montserrat: 'MSR',
+  morocco: 'MAR',
+  mozambique: 'MOZ',
+  myanmar: 'MMR',
+  namibia: 'NAM',
+  nauru: 'NRU',
+  nepal: 'NPL',
+  netherlands: 'NLD',
+  new_caledonia: 'NCL',
+  new_zealand: 'NZL',
+  nicaragua: 'NIC',
+  niger: 'NER',
+  nigeria: 'NGA',
+  northern_mariana_islands: 'MNP',
+  norway: 'NOR',
+  oman: 'OMN',
+  pakistan: 'PAK',
+  palau: 'PLW',
+  panama: 'PAN',
+  papua_new_guinea: 'PNG',
+  paraguay: 'PRY',
+  peru: 'PER',
+  philippines: 'PHL',
+  poland: 'POL',
+  portugal: 'PRT',
+  qatar: 'QAT',
+  republic_of_serbia: 'SRB',
+  romania: 'ROU',
+  russia: 'RUS',
+  rwanda: 'RWA',
+  saint_lucia: 'LCA',
+  saint_pierre_and_miquelon: 'SPM',
+  saint_vincent_and_the_grenadines: 'VCT',
+  samoa: 'WSM',
+  san_marino: 'SMR',
+  sao_tome_and_principe: 'STP',
+  saudi_arabia: 'SAU',
+  senegal: 'SEN',
+  seychelles: 'SYC',
+  sierra_leone: 'SLE',
+  singapore: 'SGP',
+  slovakia: 'SVK',
+  slovenia: 'SVN',
+  solomon_islands: 'SLB',
+  somalia: 'SOM',
+  south_africa: 'ZAF',
+  spain: 'ESP',
+  sri_lanka: 'LKA',
+  sudan: 'SDN',
+  suriname: 'SUR',
+  sweden: 'SWE',
+  switzerland: 'CHE',
+  syria: 'SYR',
+  taiwan: 'TWN',
+  tajikistan: 'TJK',
+  tanzania: 'TZA',
+  thailand: 'THA',
+  the_bahamas: 'BHS',
+  timorleste: 'TLS',
+  togo: 'TGO',
+  tonga: 'TON',
+  trinidad_and_tobago: 'TTO',
+  tunisia: 'TUN',
+  turkey: 'TUR',
+  turkmenistan: 'TKM',
+  turks_and_caicos_islands: 'TCA',
+  uganda: 'UGA',
+  uk: 'GBR',
+  ukraine: 'UKR',
+  united_arab_emirates: 'ARE',
+  united_states_minor_outlying_islands: 'UMI',
+  united_states_virgin_islands: 'VIR',
+  uruguay: 'URY',
+  usa: 'USA',
+  uzbekistan: 'UZB',
+  vanuatu: 'VUT',
+  venezuela: 'VEN',
+  vietnam: 'VNM',
+  wallis_and_futuna: 'WLF',
+  yemen: 'YEM',
+  zambia: 'ZMB',
+  zimbabwe: 'ZWE',
+};
+
+export default function migrateFromLegacy(
+  formData: PartialFormData,
+): MigrationOutput {
+  const legacy = String(formData.select_country ?? '').toLowerCase();
+  if (!legacy) return {};
+
+  if (LEGACY_TO_COMPOSITE[legacy]) {
+    return {
+      admin_level: '1',
+      composite: LEGACY_TO_COMPOSITE[legacy],
+      worldview: 'ukr',
+    };
+  }
+  if (LEGACY_TO_AGGREGATED[legacy]) {
+    const { country, region_set } = LEGACY_TO_AGGREGATED[legacy];
+    return {
+      admin_level: 'aggregated',
+      country,
+      region_set,
+      worldview: 'ukr',
+    };
+  }
+  if (LEGACY_TO_ISO_A3[legacy]) {
+    return {
+      admin_level: '1',
+      country: LEGACY_TO_ISO_A3[legacy],
+      worldview: 'ukr',
+    };
+  }
+  // Unknown legacy code — leave the country control empty so the user
+  // can re-pick. Worldview defaults flow from the control's own default.
+  return {};
+}
diff --git a/superset-frontend/plugins/plugin-chart-country-map/test/plugin/migrateFromLegacy.test.ts b/superset-frontend/plugins/plugin-chart-country-map/test/plugin/migrateFromLegacy.test.ts
new file mode 100644
index 00000000000..81c28ba9662
--- /dev/null
+++ b/superset-frontend/plugins/plugin-chart-country-map/test/plugin/migrateFromLegacy.test.ts
@@ -0,0 +1,120 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+import migrateFromLegacy from '../../src/plugin/migrateFromLegacy';
+
+test('legacy "france" → Country view with FRA pre-selected', () => {
+  expect(migrateFromLegacy({ select_country: 'france' })).toEqual({
+    admin_level: '1',
+    country: 'FRA',
+    worldview: 'ukr',
+  });
+});
+
+test('legacy "usa" → Country view with USA pre-selected', () => {
+  expect(migrateFromLegacy({ select_country: 'usa' })).toEqual({
+    admin_level: '1',
+    country: 'USA',
+    worldview: 'ukr',
+  });
+});
+
+test('legacy "uk" maps to GBR (the ISO 3166 code)', () => {
+  expect(migrateFromLegacy({ select_country: 'uk' })).toEqual({
+    admin_level: '1',
+    country: 'GBR',
+    worldview: 'ukr',
+  });
+});
+
+test('legacy "france_overseas" maps to composite, not country', () => {
+  expect(migrateFromLegacy({ select_country: 'france_overseas' })).toEqual({
+    admin_level: '1',
+    composite: 'france_overseas',
+    worldview: 'ukr',
+  });
+});
+
+test('legacy "france_regions" maps to aggregated regions for France', () => {
+  expect(migrateFromLegacy({ select_country: 'france_regions' })).toEqual({
+    admin_level: 'aggregated',
+    country: 'FRA',
+    region_set: 'regions',
+    worldview: 'ukr',
+  });
+});
+
+test('legacy "turkey_regions" maps to TUR / nuts_1', () => {
+  expect(migrateFromLegacy({ select_country: 'turkey_regions' })).toEqual({
+    admin_level: 'aggregated',
+    country: 'TUR',
+    region_set: 'nuts_1',
+    worldview: 'ukr',
+  });
+});
+
+test('legacy "italy_regions" maps to ITA / regions', () => {
+  expect(migrateFromLegacy({ select_country: 'italy_regions' })).toEqual({
+    admin_level: 'aggregated',
+    country: 'ITA',
+    region_set: 'regions',
+    worldview: 'ukr',
+  });
+});
+
+test('legacy "philippines_regions" maps to PHL / regions', () => {
+  expect(migrateFromLegacy({ select_country: 'philippines_regions' })).toEqual({
+    admin_level: 'aggregated',
+    country: 'PHL',
+    region_set: 'regions',
+    worldview: 'ukr',
+  });
+});
+
+test('uppercase / mixed case legacy values still match', () => {
+  expect(migrateFromLegacy({ select_country: 'France' })).toEqual({
+    admin_level: '1',
+    country: 'FRA',
+    worldview: 'ukr',
+  });
+});
+
+test('unknown legacy code → empty migration (user re-picks)', () => {
+  expect(migrateFromLegacy({ select_country: 'atlantis' })).toEqual({});
+});
+
+test('missing select_country → empty migration', () => {
+  expect(migrateFromLegacy({})).toEqual({});
+});
+
+test('every legacy "_regions" key resolves to an existing region_set', () => {
+  // Smoke-check that the four legacy aggregated keys all map to
+  // (country, region_set) pairs the build pipeline actually emits.
+  const cases = [
+    'france_regions',
+    'italy_regions',
+    'philippines_regions',
+    'turkey_regions',
+  ];
+  cases.forEach(name => {
+    const m = migrateFromLegacy({ select_country: name });
+    expect(m.admin_level).toBe('aggregated');
+    expect(typeof m.country).toBe('string');
+    expect(typeof m.region_set).toBe('string');
+  });
+});