Umre

Umre is an infrequently-used term for the single supercontinental landmass which dominates Urva's western hemisphere. By ancient convention (both common and scholarly), it is divided into Thelbiron, Orithea, and Ulthark, each typically considered a continent in their own right. This convention is sufficiently widespread that it is rare to hear the name Umre used outside of obscure treatises, and the average person is unlikely to know it. 
Etymology: Umre derives from archaic Tuvai "ume-ere", meaning "mother of all rivers." The origins of the term are lost to time, but it was presumably coined in reference to the many great river systems which drain the lands of Orithea, Thelbiron, and Ulthark.