'How to get in which country somebody is without using any API? Latitude and longitude countries coordinates

What is the best & easiest way to check in which country my (e.g) person is (geolocation), without using API like GoogleMaps, HereMaps etc.

I only have latitude and longitude coordinates of my (e.g) people and want to automatically check in which country they currently are.

c++sharpapilocationcoordinatespolygon


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