Deuteronomy 3:12-13

3:12 And this land, [which] we possessed at that time, from Aroer, which [is] by the river Arnon, and half mount Gilead, and the cities thereof, gave I unto the Reubenites and to the Gadites. 3:13 And the rest of Gilead, and all Bashan, [being] the kingdom of Og, gave I unto the half tribe of Manasseh; all the region of Argob, with all Bashan, which was called the land of giants.

Deuteronomy 3:16

3:16 And unto the Reubenites and unto the Gadites I gave from Gilead even unto the river Arnon half the valley, and the border even unto the river Jabbok, [which is] the border of the children of Ammon;