'Border' in the Bible

The border of the Amorites ran from the ascent of Akrabbim, from Sela and upward.

Then they went through the wilderness and around the land of Edom and the land of Moab, and came to the east side of the land of Moab, and they camped beyond the Arnon; but they did not enter the territory of Moab, for the Arnon was the border of Moab.