Deuteronomy 3:12-13

12So at that time we took possession of this land. To the Reubenites and Gadites I gave the land beyond Aroer along the Arnon Valley, and half the hill country of Gilead, along with its cities.

13To the half-tribe of Manasseh I gave the rest of Gilead and all of Bashan, the kingdom of Og. (The entire region of Argob, the whole territory of Bashan, used to be called the land of the Rephaim.)