I'm a little bit confused about some of Avistan's ethnic groups. The Shoanti are, according to Humans of Golarion, present all the way up from Varisia to Land of the Linnorm Kings and along to Numeria, yet there's very little else on that group outside Varisia and a little bit of Belkzen. Brevoy on the other hand has Varisian listed as a major language, yet I've seen little to suggest they're a major ethnic group there.
I have a big interest in ethnic politics in real life so I'm pretty curious about the make-up of Avistan's various regions and their interactions, the migration map in Humans of Golarion was a nice touch I'm just having trouble making sense of a few little bits.