Originally posted by Fester Addams:

Islands are typically rather large and can be a bother going round but I have yet to see an island that hits the "edge" of the world.

What I usually do is try to locate a river allowing passage through an island.

There were many large islands in the area we needed to go to fight Bonemass. After sailing the long way around a couple, we decided to land on one that was closer and see if we could get to his location on foot. We couldn't, but it was a good shortcut and I think it would be helpful when you're close to the edge of the world map.

Well, it's kind of a realm map, so an edge that swallows up warriors makes sense to me.