Numbers 34:5 (BSB)

where it will turn from Azmon, join the Brook of Egypt, and end at the Sea.

From Numbers 34. Also in the ESV.

Commentary on Numbers 34:5

• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Numbers 34:5: And the border shall fetch a compass,.... Not go on in a straight line, but turn about: from Azmon unto 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...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Numbers 34:5: river of Egypt--the ancient brook Sihor, the Rhinocolura of the Greeks, a little to the south of El-Arish, where this wady gently descends towards the Mediterranean (Jos 13:3).
• Geneva Bible Notes (Reformed), Geneva Bible Study Notes on Numbers 34:5: And the border shall fetch a compass from Azmon unto the river of Egypt, and the goings out of it shall be at the sea. (b) Which was Nilus, or as some think Rhinocotura.
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on Numbers 34:3-5: Num 34:3-5 The southern boundary is the same as that given in Jos 15:2-4 as the boundary of the territory of the tribe of Judah. We have first the general description, “The south side shall be to you from the desert of Zin on the sides of Edom onwards,” i.e., the land was to extend towards the south as far as the desert of Zin on the sides of Edom.