Deuteronomy 3:8
And thus we took, the same season, the land out of the hand of two kings of the Amorites on the other side Jordan, from the river of Arnon unto mount Hermon
Joshua 12:2-6
Sihon king of the Amorites that dwelt in Heshbon, and ruled from Aroer, which lieth on the brim of the river of Arnon, and to the middle of the river, and half Gilead unto the river Jabbok, the border of the children of Ammon;
Joshua 13:9-12
from Aroer that lieth on the brim of the river Arnon, with the city in the midst of the river. And all the plain of Medeba unto Dibon;
Numbers 32:33-42
And Moses gave unto the children of Gad and of Reuben, and unto the half 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 that belonged unto the cities thereof in the coasts of the country round about.