15:21a

These were the southernmost cities of the tribe of Judah in the Negev: The phrase the southernmost cities indicates the southern part of the land that the tribe of Judah received.

Here are some other ways to translate this part of the verse:

These are the southernmost towns which the people of the tribe of Judah received
-or-
The towns in the farthest south which belonged to the people of Judah

15:21b

toward the border of Edom: Kabzeel, Eder, Jagur: The phrase toward the border of Edom indicates that the towns listed in this paragraph were close to the border of the land of Edom.

Edom: The term Edom refers to a kingdom that was southeast of Judah. It was mentioned in Joshua 15:1 and you should translate it the same way in both places.

Here are some other ways to translate this part of the verse:

These towns were close to the border of the land of Edom: Kabzeel, Eder, Jagur…
-or-
they were near the border of the Edom Kingdom. They are as follows: Kabzeel, Eder, Jagur…

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