Judges 11:16, 18

When the Israelites left Egypt, they passed through the desert to the Red Sea and came to Kadesh.

Leaving from there, they traveled through the desert in order to bypass the land of Edom and the land of Moab. When they arrived at the east side of Moab, on the other side of the River Arnon, they made camp there, but they did not cross the Arnon because it was Moab’s boundary.