GADM
GADM (Database of Global Administrative Areas) provides maps and spatial data of administrative boundaries for all countries and their sub-divisions. The current version (4.1) delimits over 400,000 administrative areas across multiple levels, from countries down to local divisions. The polygons are distributed for download by country or for the entire world in several geospatial formats. GADM is used as an upstream source of administrative boundary data by projects such as KnowWhereGraph.
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