Originally posted by The MG
We seem to be on about the same page, here, except that the Tengese should really be speaking a Seatongue language, or a form of Low Realm.
Or both, most likely.
I don't think there's any evidence that the Tengese people and culture originated in the West or on the Blessed Isle, at least as per Blood and Salt
. Whether the Southwest as a whole counts as "South" or "West" for linguistic purposes is an open question, but given the West's overall isolation, I'd expect the landbound Southwest to be more closely culturally connected to the South. (For reasons of simplicity, playability, and wordcount, it's best to keep the language section of character creation as straightforward as possible, which means sticking with the admittedly over-stylized Directional language categories rather than creating whole new language categories for new players to puzzle over.)
I'd expect that the Tengese language would incorporate significant lexical borrowing from Seatongue. Low Realm, less so; that's the language of the Realm peasantry, and I doubt there's significant interaction between the Realm's lower classes and the Tengese, at least no more so than any other satrapy.