Deuteronomy 3:8
And we took at that time the land out of the hand of the two kings of the Amorites, that were on this side the Jordan, from the river Arnon to mount Hermon
Joshua 12:2-6
Sihon the king of the Amorites, who dwelt at Heshbon, and ruled from Aroer, which is upon the bank of the river Arnon, and from the middle of the ravine, and over half Gilead, as far as the river Jabbok, which is the border of the children of Ammon;
Joshua 13:9-12
from Aroer, which is on the bank of the river Arnon, and the city that is in the midst of the ravine, and all the plateau of Medeba to Dibon,
Numbers 32:33-42
And Moses gave to them, to the children of Gad, and to the children of Reuben, and to half the tribe of Manasseh the son of Joseph, the kingdom of Sihon king of the Amorites, and the kingdom of Og the king of Bashan, the land, according to its cities and territories, the cities of the land round about.