Numbers 34:3-4

3then your south quarter shall be from the wilderness of Zin along by the side of Edom, and your south border shall be from the end of the Salt Sea eastward;

4and your border shall turn about southward of the ascent of Akrabbim, and pass along to Zin; and the goings out thereof shall be southward of Kadesh-barnea; and it shall go forth to Hazar-addar, and pass along to Azmon;