What there is to have knowledge of may run broad and deep.
There is a map provided at the link https://upload.wikimedia.org/wikipedia/commons/3/33/Southeast_Asia_Political_Map_World_Factbook_2020.png
that could help get a basic understanding and get one on track to understanding of the basic geography of the region.
Screenshot of a portion of the map respectfully submitted January 8, 2026 evening EST, below:
