Joshua 12:1-2

1Now these are the kings of the land whom the sons of Israel defeated, and whose land they possessed beyond the Jordan toward the east, from the valley of the [river] Arnon to Mount Hermon, and all the Arabah [plain] to the east:

2Sihon king of the Amorites, who lived in Heshbon, and ruled from Aroer, which is on the edge of the valley of the [river] Arnon, both the middle of the valley and half of Gilead, and as far as the brook Jabbok, [which is] the border of the sons of Ammon;