John Gill Commentary Numbers 34:5

"and the border shall turn about from Azmon unto the brook of Egypt, and the goings out thereof shall be at the sea." — Numbers 34:5 (ASV)

And the border shall fetch a compass
Not go on in a straight line, but turn about:

from Azmon to the river of Egypt ;
the river Nile, as both the Targums of Jonathan and Jerusalem; but Aben Ezra seems to deny that that river is meant: and some think that Rhinocolura, which flows into the Mediterranean sea, is meant; or the "valley of Egypt", Casiotis, which divided Judea from Egypt, as follows:

and the goings out of it ;
not of the river, but of the border:

shall be at the sea ;
the above sea, called in the next verse the great sea; all the Targums render it to the west.