Deuteronomy 3:12-13

12When we had taken power over all that land, I gave some of it to the tribes of Reuben and Gad. I gave them the land north of Aroer near the Arnon valley. I also gave them half of the hill country of Gilead and the cities there.

13I gave the other part of Gilead to one half of the tribe of Manasseh. I also gave Og's kingdom, Bashan, to them. People called all the region of Argob in Bashan the land of the Rephaites.