Deuteronomy 4:46-48

46on this side of the Jordan, in the valley opposite Beth Peor, in the land of Sihon king of the Amorites, who dwelt at Heshbon, whom Moses and the children of Israel defeated after they came out of Egypt.

47And they took possession of his land and the land of Og king of Bashan, two kings of the Amorites, who were on this side of the Jordan, toward the rising of the sun,

48from Aroer, which is on the bank of the River Arnon, even to Mount Sion (that is, Hermon),