John Gill Commentary Ezekiel 47:19

"And the south side southward shall be from Tamar as far as the waters of Meriboth-kadesh, to the brook [of Egypt], unto the great sea. This is the south side southward." — Ezekiel 47:19 (ASV)

And the south side southward from Tamar Not Jericho, as the Targum, Jarchi, and Kimchi, called by this name from the palm trees which grew near it; according to Jerom, this is Palmyra, so called for the same reason; but it is rather Engedi, called Hazazontamar, (2 Chronicles 20:2) , the line of the southern border began here, and went on,

even to the waters of strife in Kadesh ; to the waters of Meribah in Kadesh; so called, from the strivings of the children of Israel with the Lord there, (Numbers 20:1Numbers 20:13) :

the river to the great sea ; it proceeded by the river of Egypt, the river Sihor, the Nile, which is before Egypt, (Joshua 13:3) (15:47) and so on to the Mediterranean sea:

and this is the south side southward ; the south side of the land, and the southern border of it.