Bamidbar 34:4

ונסב לכם הגבול מנגב למעלה עקרבים — AND YOUR BORDER SHALL TURN ABOUT SOUTHWARD OF THE ASCENT OF AKRABBIM - In every passage in this chapter where it says ונסב or ויצא, it tells us that the boundary line was not straight (i.e., did not continue in the same straight line) but in proceeding it projected outside this straight line. Here, the word means that the boundary line left the straight line and bent towards the north of the world (in a northerly direction) diagonally towards the west, and the boundary line passed by the south of the Ascent of Akrabbim. Consequently the Ascent of Akrabbim was within the boundary (cf. Rashi on Joshua 15:3). ועבר צנה IT SHALL PASS ALONG TO ZIN — צנה is the same as אל צין “to Zin”, like מצרימה "to Egypt". והיו תוצאתיו AND THE GOINGS OUT THEREOF SHALL BE — i.e., its ends shall be at the south of Kadesh-Barnea. ויצא חצר אדר AND IT SHALL GO FORTH TO HAZZAR-ADDAR — the boundary spreads and widens towards the north of the world and extends further obliquely to the west, till it comes to Hazzar-Addar, thence to Azmon and thence to the Brook of Egypt. — The expression ונסב, "and it turned about” which is used here (v. 5) (“and the boundary shall turn about”) is employed because it wrote, “and it shall go forth to Hazzar-Addar”, i.e., that it began to widen out when it had passed Kadesh-Bamea. The widening of that strip which projected northwards was only from Kadesh-Barnea to Azmon (i.e. that strip widened only between those two places), but from Azmon and further on, the boundary became narrower and turned towards the south and came to the Brook of Egypt, and thence westwards to the Great Sea which is the western boundary of the entire land of Israel. It follows, therefore, that the Brook of Egypt is at the south-west corner.

וְנָסַ֣ב לָכֶם֩ הַגְּב֨וּל מִנֶּ֜גֶב לְמַעֲלֵ֤ה עַקְרַבִּים֙ וְעָ֣בַר צִ֔נָה (והיה) [וְהָיוּ֙] תּֽוֹצְאֹתָ֔יו מִנֶּ֖גֶב לְקָדֵ֣שׁ בַּרְנֵ֑עַ וְיָצָ֥א חֲצַר־אַדָּ֖ר וְעָבַ֥ר עַצְמֹֽנָה׃

and your border shall turn from the Negev to Ma῾ale-῾aqrabbim, and pass on to Żin: and its limits shall be from the south to Qadesh-barnea, and shall go on to Ḥażar-addar, and pass on to ῾Ażmon: