I had one pop up in a quite similar location on 3.52; perhaps it is a more likely area than others due to its proximity to Njerpland. Mine was on an island just north of Reemi and about an hours walk/boatride from my cabin. Didn't appear until I'd killed twenty or so single Njerps and wiped out a couple of their settlements, so I always suspected the motivation of vengeance for such an aggressive location. Far more value in stripping the dozen or so reindeer hides from their kotas than looting their bodies, but it was also neat to get a few ready made buildings