Joshua 13:8, 16-17

The other half of Manasseh, the Reubenites and the Gadites had received the inheritance that Moses had given them east of the Jordan, as he, the servant of the LORD, had assigned it to them.

The territory from Aroer on the rim of the Arnon Gorge, and from the town in the middle of the gorge, and the whole plateau past Medeba to Heshbon and all its towns on the plateau, including Dibon, Bamoth Baal, Beth Baal Meon