The Arnon, now the Wady Mojeb, an impetuous torrent, divided the territory which remained to the Moabites from that which the Amorites had wrested from them, Numbers 21:26.
Related Commentaries of Numbers 21:13
Numbers 21:13
13 From thence they removed, and pitched on the other side of Arnon, which is in the wilderness that cometh out of the coasts of the Amorites: for Arnon is the border of Moab, between Moab and the Amorites.