Why would you not want your character to know that? presumably your character knows what regions are Aurvandil's, Barca's, Terrans, and Asylon's. The area in between all those belongs to the Zuma (or is a rogue region that the Zuma wouldn't like you marching an army into).
I believe Tom previously said, though this was months ago so I could be wrong that it was previously intentional for characters to not know which regions belong to Zuma without traveling. Obviously most the land is Zuma but if there was a spare rogue region than if the Zuma aren't controlling they probably won't care if you took it.
