Do not use third-party mirror sites. Always use https://gadm.org/download_country_v3 or https://gadm.org/download_world_v3 .
You can access the data through several official and community-supported channels: download gadm data version 36 work
Simply drag and drop the GeoPackage or Shapefile into your workspace. The coordinate reference system (CRS) is standard WGS84 (longitude/latitude) . Key Considerations Do not use third-party mirror sites
Key characteristics of GADM 3.6:
library(sf) gadm <- st_read("path/to/gadm36_levels_gpkg/gadm36.gpkg") # or .shp/.geojson plot(st_geometry(gadm)) download gadm data version 36 work
While high-resolution, GADM is not an "official" government source and may have minor inaccuracies. It is often praised for its responsiveness to public feedback for corrections.