I actually like this idea, but the issue I have is how you can't fully traverse some areas without flying. What immediately comes to mind is The Peaks and Amh Araeng. With Peaks, if you enter from the north, you cannot go southward on foot, because of the higher elevation in the south. With Amh Araeng, while it's possible to go east to west via that cave behind Mord Souq, it's impossible to go west and east with that same route because of the cliff.