וְתָאַ֨ר הַגְּב֜וּל מֵרֹ֣אשׁ הָהָ֗ר אֶל־מַעְיַן֙ מֵ֣י נֶפְתּ֔וֹחַ וְיָצָ֖א אֶל־עָרֵ֣י הַר־עֶפְר֑וֹן וְתָאַ֤ר הַגְּבוּל֙ בַּעֲלָ֔ה הִ֖יא קִרְיַ֥ת יְעָרִֽים׃
Du sommet de la montagne, la limite s’infléchit vers la source de Mê-Neftoah, se dirige vers les villes de la montagne d’Efrôn, tourne vers Baala, qui est Kiryath-Yearim,
Chizkuni
דרך האתרים, the correct spelling ought to be התארים, the letters having been inverted similar to when we find כבשים spelled as כשבים, (sheep) or שמלה as שלמה (garment). Compare Joshua 15,9: ותאר הגבול, “and the boundary curved, i.e. was inverted;” When the Amalekites heard that the Israelites had marched around the territory of Edom from north to south, as stated in Numbers 21,4, they concluded that they would now attack from the southern region of Edom. They used this as an opportunity to attack them as they had displayed fear of the Edomites.
Rashi
From Baalei Yehuda. This is [the city of] Kiryas Yearim as it is said in Yehoshua, "and the boundary circled" and went up "to Baaloh, which is Kiryas Yearim" (Yehoshua 15:9). This also [can be found] in Divrei Hayomim, "Dovid and all Yisroel went up to Baaloh, which is Kiryas Yearim" (Divrei Hayomim I, 13:6). [The word] Baal means a plain.
Ibn Ezra
יתארהו He forms it or he draws the outlines; comp. ותאר הגבול and the border was drawn (Jos. 15:9).
Rashi
and with a compass he rounds it Heb. יְתָאֳרֵהוּ, an expression similar to (Josh. 15:9): “And the border circled (וְתָאַר).” If he comes to make circular drawings, he draws around it with a compass, compas in French.