Joshua 18:15

And the south coast goeth from the edge of Kiriathjearim westward, and goeth out to the water well of Nephtoah;

Joshua 15:9

and then it draweth from the sand hill unto the fountain of water called Nephtoah, and goeth out at the cities of mount Ephron; and draweth to Baalah, otherwise called Kiriathjearim;

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 then it draweth from the sand hill unto the fountain of water called Nephtoah, and goeth out at the cities of mount Ephron; and draweth to Baalah, otherwise called Kiriathjearim;