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GADM version 3.6 (released May 6, 2018) is a foundational dataset for spatial analysis, delimiting 386,735 administrative areas worldwide. While newer versions like 4.1 exist, 3.6 remains widely used due to its stable system, which was specifically fixed in this release after errors in version 3.4. How to Download Version 3.6
If you are working within a specific GIS environment, you can use these tools to automate the process: download gadm data version 36 work
GADM data is provided in several formats to support various software environments: GID identifier GADM version 3