יהושע, פרק ט״ו, פסוק י״ב

The final boundaries of the Tribe of Judah outline the western edge of their land, completing the map of their total inheritance. This western border stretches from north to south [מצודת דוד]. It runs along the coast, starting from the southern edge near the River of Egypt and reaching all the way up to the mouth of the Sorek stream in the northern area of Palmachim [ביאור שטיינזלץ].

While the boundary is defined by the Mediterranean Sea, the territory does not simply stop at the water's edge. The commentators agree that the land grant extends further to include the coastal strip itself [רד״ק, ביאור שטיינזלץ]. Furthermore, any islands and sandbars located within the sea are also considered an official part of the tribe's inheritance [מצודת דוד, ביאור שטיינזלץ]. Ultimately, this continuous boundary completely circles the region, outlining the dwelling places for all the families of the tribe [מצודת דוד].