Joshua 18:14-15

18:14 It then turned on the west side southward from the hill near Beth Horon on the south and extended to Kiriath Baal (that is, Kiriath Jearim), a city belonging to the tribe of Judah. This is the western border. 18:15 The southern side started on the edge of Kiriath Jearim and extended westward to the spring of the waters of Nephtoah.