Joshua 12:1-2

1These are the kings east of the Jordan River who had been killed by the Israelites and whose land was taken. Their territory extended from the Arnon Gorge to Mount Hermon and included all the land east of the Jordan Valley.

2King Sihon of the Amorites, who lived in Heshbon, was defeated. His kingdom included Aroer, on the edge of the Arnon Gorge, and extended from the middle of the Arnon Gorge to the Jabbok River, which serves as a border for the Ammonites. This territory included the southern half of the territory of Gilead.