TSK · Deuteronomy 3:4

Land Assignment So Moses gave to the Gadites, the Reubenites, and to half the tribe of Manasseh son of Joseph the realm of King Sihon of the Amorites, and the realm of King Og of Bashan, the entire land with its cities and the territory surrounding them.

Their territory started at Mahanaim and encompassed all Bashan, the whole realm of King Og of Bashan, including all sixty cities in Havvoth Jair in Bashan.