Joshua 13:8-10

8With the other half-tribe the Reubenites and the Gadites received their inheritance, which Moses had given them, beyond the Jordan eastward, as Moses the servant of the Lord had given them:

9from Aroer which is on the bank of the River Arnon, and the town that is in the midst of the ravine, and all the plain of Medeba as far as Dibon;

10all the cities of Sihon king of the Amorites, who reigned in Heshbon, as far as the border of the children of Ammon;