Is there a publicly available dataset somewhere that lists all country-adjacencies (pairs of countries that share a land border)?
Background: I want to programmatically access the list of countries that share a (land)border with country X.
Example: I programmatically want to access all of Luxembourgs neighboring countries, so having a dataset that contains these entries:
LU BE LU DE LU FR
Would allow my program to do useful stuff with the list [BE,DE,FR].