נֶפְתּוֹחַNephtôwach

proper name [of a location]: on border of Judah and Benjamin (Joshua 15:9; Joshua 18:15)

Pronunciation: nef-to'-akh · Hebrew/Aramaic (Old Testament) · H5318

Same root

פָּתַחpâthach · H6605to open wide (literally or figuratively); specifically, to loosen, begin, plough, carve

Where it appears

Appears 2 times in the Bible.

Joshua 15:9 From there the boundary extended from the top of the mountain to the spring at the waters of Nephtoah, and from there to the towns on Mount Ephron. Then it turned toward Baalah (that is, Kiriath-jearim).
Joshua 18:15 The southern boundary began at the outskirts of Kiriath-jearim. From that western point it ran to the spring at the waters of Nephtoah,

Source: Brown, Driver and Briggs, Hebrew and English Lexicon of the Old Testament (1906), public domain; markup by unfoldingWord, CC BY (github.com/unfoldingWord/Brown-Driver-Briggs-Enhanced).