Get hierarchical list of all boundaries with ADM1 nested under ADM0.

Returns a complete list without pagination, including GeoJSON and TopoJSON download URLs for both ADM0 and ADM1 levels. ADM1 boundaries are nested under their parent ADM0 country.

Query Parameters:

• release_type: geoBoundaries release type (gbOpen, gbHumanitarian, gbAuthoritative, default: gbOpen)

Returns:

• 200: Hierarchical boundary list with download links organized by country
• 400: Invalid query parameters
• 500: Server error

Response Structure: { "data": [ { "boundaryISO": "USA", "boundaryName": "United States", "releaseType": "gbOpen", "adm0_geojson_url": "https://...", "adm0_topojson_url": "https://...", "adm1_geojson_url": "https://...", "adm1_topojson_url": "https://...", "admin1_units": [ { "shapeID": "66186276B98555229882405", "shapeName": "Washington" }, ... ] }, ... ] }