Interestingly I found the Iobarian map has a scale as well, one that wasn't included in the book.
The thing that gets me about the Iobaria map is that it shows the Castrovian Sea as being maybe 200 miles from the Dunsward and the Noman Highlands. When I look at the Kingmaker map, I think of the east side of the Tors of Levenies as being steppes or high plains, but with the Castrovian Sea so close, it's almost a coastal plain. The bottom of the Hills of Noman might break up the plain just before it gets to the coast, but not much. That makes the Dunsward a MUCH more desirable location as a trade route between Brevoy and the whole Castrovian Sea. I looked at Varnhold as isolated, but given it's location between Restov and the Castrovian Sea, it's got to be one of Restov's priorities and it's potential link to the sea.
In general, the Castrovian Sea is really close to the left side of the Inner Sea map and I'd love to know what that sliver on the far side of the World's Edge Mountains and just south of the Hills of Noman - basically, the Castrovian Sea's west shore - looks like. It seems like it ought to be much more linked to Inner Sea goings on than it has been presented.