Charles Ellicott Commentary Numbers 34:4

"and 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;" — Numbers 34:4 (ASV)

And your border shall turn from the south ... — Better, And your border will turn on (or, to) the south side of the ascent of Akrabbim, and will pass over to Zin; and the goings forth thereof will be on the south of Kadesh-barnea.

The meaning appears to be that the boundary line was to run in a south-westerly direction from the southern point (or, tongue) of the Dead Sea, as far as the height (or, ascent) of Akrabbim. From this point, it was to continue in a westerly direction as far as Kadesh-barnea, which was at the western extremity of the Desert of Zin and was to be included within the Israelite territory.

What is here called the Height of Akrabbim is thought to be a row of white cliffs that run obliquely across the Arabah, about eight miles from the Dead Sea. .