The vale of Tviervith is nestled between two arms of the Estbjar range and Hlutmont. The more northerly region of the valley is sparsely settled, those towns that are in the region being on high defensible hills surrounded by an outwall with some grove or farm land inside the walls. This area has many towns wholly dedicated to smelting and refining the ore that comes down from Hlutmont.
The more southerly region of Tviervith is heavily settled like much of Arinnfal, major town “centers” being only discernible because of their extremely ornate temples to Eiri Earthfather and Helden Stonemother. In the most easterly portion of this area the land is more heavily fortified, for it faces Claulan and the Claulan Gap. There are even a few garrison-towns that sit like hard iron knots within the verdant farmland.