Saw this in a video today posted on youtube. The map was originally supposed to be four times the size it is now: Here's a link to the video for those of you who might be interested:
So only 1/4 (the upper left part) was realized in the final game. And the main island of Sosoria also looks very much like North America.
Almost looks like the maps of Sosaria from Ultima I, Lands of Danger and Despair, Lands of the Dark Unknown, and all that?