I'm thinking west of the aeridanish islands activity really drops (like CPAC) because that's the center of the gyre (kind of...) and there's a bit of a cold current coming south there. But yeah, it probably extends further east to Loviniosa.
That basin could be partitioned between Loviniosa and Aeridani, or could all go to Aeridani.
Where the Aiotan/Ezheatio division is, they can suggest something or I could just make it.