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.
After that, they moved and set up camp on the other side of the Arnon River, in a desert area near where the Amorites' land begins. The Arnon River marks the boundary between Moab and the Amorites.