Urem

Urem is the huge, mostly low-lying region that makes up the northeastern part of Orithea proper. It is the historical homeland of the Uremite peoples. Geographically, its defining features are the Great Plain of Tethas (also called simply the Great Northern Plain or, unsurprisingly, the Uremite Plain or the Plain of Urem) and the mighty River Rhanna which flows across it, along with its countless lesser tributaries. 
Today, essentially all of Urem lies within the borders of the Kirdan Empire. This was not always the case; prior to the conquests of Torkai Ul-Tash, there were a number of powerful Uremite kingdoms in the region, with dynasties stretching back to the aftermath of the Great Cataclysm. Prior to that, the region had been subject to the domination of Qoss, with the Uremite peoples prevented from establishing their own strong independent states.