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).
Or, you know, if you live in any of those realms you basically just know, "Hey, all that awful burnt-out wasteland over there surrounding the huge menacing Volcano, Evil Dark Tower, and Ancient Stronghold of Sacrifice? Yeah. Zuma land."
