Roger
He/him
- AKA
- Minato
There is literally no world-building outside of the UK in the Harry Potter series (note: there is outside of England. Hogwarts is in Scotland for example) aside from the mention of Durmstrang (which is supposed to be in Scandinavia but takes in students from all over Europe) and Beauxbatons (France). Even then, those are just schools with locations. I think Fleur mentions the French ministry equivalent once in HBP but that's it.
It all falls apart rather easily, JK is terrible with numbers and detail in general. As someone who was obsessed with reading all of her interviews to form theories between book releases it's something I noticed a long time ago. At one point she tried to say the magical (human) population of the UK was somewhere around 3000, but there were 40 students in each Hogwarts year (40 whose names she wrote down in Harry's year, meaning around 10 students per house per year).
Rowling has plenty of math screw ups but that one make sense: you got 40 for every year multiplied by 150~ minus unnatural deaths. you don't need alchemy to get crazy old as a wizard Aberforth, Bode, Bathilda Bagshot, Dumbledores OWLs examiner all didn't.