Deuteronomy 3:12-16

Of the land that we took over at that time, I gave the Reubenites and the Gadites the territory north of Aroer by the Arnon Gorge, including half the hill country of Gilead, together with its towns. The rest of Gilead and also all of Bashan, the kingdom of Og, I gave to the half-tribe of Manasseh. (The whole region of Argob in Bashan used to be known as a land of the Rephaites. Jair, a descendant of Manasseh, took the whole region of Argob as far as the border of the Geshurites and the Maakathites; it was named after him, so that to this day Bashan is called Havvoth Jair.) And I gave Gilead to Makir. But to the Reubenites and the Gadites I gave the territory extending from Gilead down to the Arnon Gorge (the middle of the gorge being the border) and out to the Jabbok River, which is the border of the Ammonites.