My son is into playing GeoGuessr where you get a random Google street view and guess where you are based on clues in the scene. I thought I had a fairly good sense of geography but through watching him play I realized how bad I am at placing countries on a map. So I've been shamed into making sure I know where every country is and it has been surprisingly fun. I started with a quiz of African countries combined with reading wikipedia articles which helps me remember. https://www.geoguessr.com/vgp/3163