If you hear, let’s say, Somalia, normally people would know it’s roughly somewhere east in Africa, Uruguay somewhere in South America etc.
I’ve traveled a lot and only from Americans I’ve heard them say about countries they’ve “never heard of it”. When I say I’m in Czechia, they just call it Chechnya, when I say I’m Dutch they love to mix that up with Denmark for some reason, etc.
Their excuse is always the same too: their school sucks. Dude, we didn’t learn this stuff in school neither. It’s common interest about the world around you, watching the news, etc. Half the countries you “don’t know” were bombed by you.
There’s not a lot of places accepting those currencies. Either take a European currency or US$.
But better to not take cash at all, especially that much. You have to declare it etc. Just pay by card and use ATMs if you really need cash.