Joshua 18:15

And the south part is from the farthest point of Kiriath-jearim, and the line goes out to the west to the fountain of the waters of Nephtoah:

Joshua 15:9

And the limit is marked out from the top of the mountain to the fountain of the waters of Nephtoah, and out to the towns of Mount Ephron, as far as Baalah (which is Kiriath-jearim):

Treasury of Scripture Knowledge

Summary

And the south quarter was from the end of Kirjathjearim, and the border went out on the west, and went out to the well of waters of Nephtoah:

Nephtoah

Bible References

Nephtoah

Joshua 15:9
And the limit is marked out from the top of the mountain to the fountain of the waters of Nephtoah, and out to the towns of Mount Ephron, as far as Baalah (which is Kiriath-jearim):

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain