יהושע, פרק ט״ז, פסוק ג׳

The southern border of the territory inherited by the descendants of Joseph continues its path by descending westward. As the boundary line moves across the landscape, it passes through specific geographic landmarks. Upon reaching Lower Beth Horon, the border specifically runs along the southern side of the city [מצודת דוד]. The route ultimately comes to an end when it reaches the Great Sea. This termination point at the sea serves as the absolute edge of the territory, bringing the layout of Joseph's southern border to a complete close.