The Tribes of Israel: Reuben, Gad and Half Manasseh: Settled on East Side of Jordan
Source: TTT
Deuteronomy 3:12–17
So 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. / To 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.) / Jair, a descendant of Manasseh, took the whole region of Argob as far as the border of the Geshurites and Maacathites. He renamed Bashan after himself, Havvoth-jair, by which it is called to this day.
Joshua 13:23–32
And the border of the Reubenites was the bank of the Jordan. This was the inheritance of the clans of the Reubenites, including the cities and villages. / This is what Moses had given to the clans of the tribe of Gad: / The territory of Jazer, all the cities of Gilead, and half the land of the Ammonites as far as Aroer, near Rabbah;