Numbers 21:13

Having left that place behind, they then made camp opposite Arnon, which is in the desert, and which juts out at the borders of the Amorite. For certainly Arnon is at the limit of Moab, dividing the Moabites and the Amorites

Other versions

King James Version

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

English Standard Version

From there they set out and camped on the other side of the Arnon, which is in the wilderness that extends from the border of the Amorites, for the Arnon is the border of Moab, between Moab and the Amorites.

New International Version

They set out from there and camped alongside the Arnon, which is in the desert extending into Amorite territory. The Arnon is the border of Moab, between Moab and the Amorites.