Read Joshua 18:15 Using Other Translations
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:
And the southern side begins at the outskirts of Kiriath-jearim. And the boundary goes from there to Ephron,to the spring of the waters of Nephtoah.
The southern boundary began at the outskirts of Kiriath-jearim. From that western point it ran to the spring at the waters of Nephtoah,