What is the meaning of "v'Sa'ar"?
Rashi: It is to turn in a circle, like "uva'Mechugah Yesa'arehu" (Yeshayah 44:13).
Rashi citing Targum Yonasan: Va'Yischar (Lev Yitzchak
What is Mayan Mei Nefto'ach?
Radak: This is what Chachamim called Ein Eitam (refer to 13:8:1:1).
To which direction does the border go?
Rashi: It goes to the north and widens until the cities of Har Efron, and envelops Ba'alah on the north.
Why does it say "Hi Kiryas Ye'arim"?
Malbim: There was another Ba'alah in the south (verse 29), it is Balah that was given to Shimon (19:3). This is why Kiryas Ye'arim is called Ba'alei Yehudah (Shmuel 2 6:2).