Thanks for the feedback everyone. I'll try some of those suggestions tonight.

By the way those little blocks aren't towns or buildings. =P They are supposed to represent large clusters of columnar basalt which has an important role in the story of this world. It's hard to make out because I reduced the size of the map by 50% to upload it.

All the towns and roads and castles and manors will be icons and such. None of that is on there at the moment though - I'm just trying to get the base map right first.