Joshua 12:2 TLB

[2] King Sihon of the Amorites, who lived in Heshbon. His kingdom extended from Aroer, on the edge of the Arnon Valley, and from the middle of the valley of the Arnon River to the Jabbok River, which is the boundary of the Ammonites. This includes half of the present area of Gilead, which lies north of the Jabbok River.