"FLAT AZEROTH THEORY"

For years we have been told that Azeroth is a round planet. Yet all the maps show that it is flat. Moreover, it seems to be full of mysterious wormholes that bend space and time itself. Have you ever taken a zepplin from one continent to the other? Did you notice that there is no curvature to the horizon? Did you also notice that we never get to see the entire flight? Why is that? What are the powers that be hiding?