Deuteronomy 3:12-13

12“At that time we took possession of this land. I gave to the Reubenites and Gadites the area extending from Aroer by the Arnon Valley, and half the hill country of Gilead along with its cities.

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