The king of the children of Ammon answered to the messengers of Jephthah, Because Israel took away my land, when he came up out of Egypt, from the Arnon even to the Jabbok, and to the Jordan: now therefore restore those [lands] again peaceably.
from Arnon even unto Jabbok, and unto Jordan; the river Arnon was the border between Moab and the Amorites, and the river Jabbok was the border of the children of Ammon, Numbers 21:13, the one was to the south of the country claimed, and the other to the north and to the west, which was Jordan, and the wilderness to the east, Judges 11:22,