Joshua 13:8-10

8The other half of Manasseh, Reuben, and Gad received their allotted tribal lands beyond the Jordan, just as Moses, the Lord’s servant, had assigned them.

9Their territory started from Aroer (on the edge of the Arnon Valley), included the city in the middle of the valley, the whole plain of Medeba as far as Dibon,

10and all the cities of King Sihon of the Amorites who ruled in Heshbon, and ended at the Ammonite border.