Which is absolutely fine, but you should still have easy access by boat to the swamps where Bonemass is located. Who knows, maybe this swamp borders on the farside to a Meadows or Black Forest?

Explore and find out. Good Luck!

Edit: TBH, the northern spawn point from Bonemass does not look at all to be blocked by plains. I would go there and check it out.

Carefully, of course.