Might also be fun to play around in Google Earth (it's still around!), maybe in VR. Or make some maps together in Felt.com (easy) or QGIS (harder).
Oh, and there are a bunch of scratch-off maps you can get too (on Amazon and elsewhere). Might be fun to combine those with country-specific games, or trivia, or whatever.
There are also these books: https://brilliantmaps.com/book/ And that website has a link to other board games too: https://brilliantmaps.com/strategy-board-games/
An atlas of world history might be similarly good, to give him some sense of how the world's geography keeps changing over time.