Verses with the word nephtoah in the Old Testament (2 verses):

Joshua 15:9
And the border was drawn from the top of the hill unto the fountain of the water of Nephtoah, and went out to the cities of mount Ephron; and the border was drawn to Baalah, which is Kirjathjearim:

Joshua 18:15
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: