Deuteronomy 3:8
And we also took at that time out of the hand of the two kings of the Amorites the land that was on this side of the Jordan, from the river of Arnon unto Mount Hermon
Joshua 12:2-6
Sihon, king of the Amorites, who dwelt in Heshbon, and ruled from Aroer, which is upon the bank of the river Arnon, and from the midst of the river and from half of Gilead, even unto the river Jabbok, which is the border of the sons of Ammon,
Joshua 13:9-12
from Aroer, that is upon the bank of the river Arnon, and the city that is in the midst of the river and all the plain of Medeba unto Dibon;
Numbers 32:33-42
Thus Moses gave unto the sons of Gad and to the sons of Reuben and unto half the tribe of Manasseh, the son of Joseph, the kingdom of Sihon king of the Amorites and the kingdom of Og king of Bashan, the land, with its cities and borders, even the cities of the country round about.