Charles Ellicott Commentary Joshua 15:2

"And their south border was from the uttermost part of the Salt Sea, from the bay that looketh southward;" — Joshua 15:2 (ASV)

Their south border. The southern boundary of Judah is described by Conder (Bible Handbook, p. 257) as follows: "The south boundary of Judah is described from east to west, and later became that of Simeon . Although the points mentioned along the border are not all certainly known, there is no doubt that the great mountain wall which extends from the Dead Sea to the watershed south of Rehoboth (Er-Ruheibeh) formed the natural and recognised boundary of Palestine, while the river of Egypt (Joshua 15:4) is generally supposed to be the present Wâdy-el’-Arish, the northern boundary between Syria and Egypt.

"The north branch of this valley (Wâdy-el-Abiad) rises near ‘Abdeh (Ebodah), south of Rehoboth, and thereby carries on the boundary from the mountain rampart. A new identification of importance can be mentioned here, namely, Hezron (Joshua 15:3), the next point to Kadesh-barnea on the west side. Kadesh has been shown to lie probably in the neighbourhood of Wâdy-el-Yemen, and immediately west of that valley is the mountain called Hadîreh, a name radically identical with Hezron."