The southern border of Gad will run from Tamar to the waters of Meribath-kadesh, then along the Brook of Egypt and out to the Great Sea.
It was round about eighteen thousand measures,.... Putting the numbers together which each side made, the circumference of the city was eighteen thousand measures; which, according to Cornelius a Lapide, were thirty two thousand miles; which shows that no city literally taken can be here meant, but mystically and spiritually the church of Christ, which will be of great extent in the latter day; and...
And by the border of Gad, at the south side southward, the border shall be even from Tamar [to] the waters of strife [in] Kadesh, [and] to the river toward the great sea. (f) Which is here taken for Idumea. (g) Which was Jericho the city of palm trees. (h) Meaning, the Nile that runs into the sea called the Mediterranean.
From Tamar - in Kadesh - The former was on the south of the Dead Sea; and the latter, or Kadesh-Barnea, was still farther south, and at the extremity of the portion of Gad, which was the most southern tribe, as Dan was the most northern.