12 And the western border was the coastline of the Great Sea. These are the boundaries around the clans of the descendants of Judah.
Joshua 15:12 Cross References - BSB
Numbers 34:6-7
Deuteronomy 11:24
24 Every place where the sole of your foot treads will be yours. Your territory will extend from the wilderness to Lebanon, and from the Euphrates River to the Western Sea.
Joshua 15:47
47 Ashdod, with its towns and villages; Gaza, with its towns and villages, as far as the Brook of Egypt and the coastline of the Great Sea.
Ezekiel 47:20
20 And on the west side, the Great Sea will be the boundary up to a point opposite Lebo-hamath. This will be the western boundary.