Joshua 13:8-10

8Half the tribe of Manasseh and the tribes of Reuben and Gad had already received their grants of land on the east side of the Jordan, for Moses, the servant of the Lord, had previously assigned this land to them.

9Their territory extended from Aroer on the edge of the Arnon Gorge (including the town in the middle of the gorge) to the plain beyond Medeba, as far as Dibon.

10It also included all the towns of King Sihon of the Amorites, who had reigned in Heshbon, and extended as far as the borders of Ammon.