Geography

The map despite being on a 3D plane will still have to be represented on a 2D plane.

The edges of the map are defined by large swathes of unsailable air.

North West Edge: is Grandmother Storm which makes sailing impossible for all but the most foolhardy of Duvel Cai.

South West Edge: is an impassable wall of unbreathable air. Technology or enchantments have not developed to the point to explore beyond that impasse.

North East Edge: is open sky the empire was expanding in that direction before the civil war. Much of it remains unexplored and is very much frontier territory.

South East Edge: Here be dragons... til I figure out what's there.