The western side of the Main Continent (aka "Thentao") is home to Mosaî, the “Hidden Empire” – where the V3 campaign takes place.
Farther inland is a vast desert known as the "Sea of Sand" – home to the nomadic Fadil tribes. The desert is bounded on the north by the “Border Mountains” (the largest mountain range on the prime world) and on the south by the "Dry River".
The rugged northwestern shore and the “Border Mountains” form an effective geographic boundary between the central region and the “civilized” northern kingdoms.