Joshua 15:12
And the west border was to the great sea, and the coast thereof. This is the coast of the children of Judah round about according to their families.
Cross-reference
Joshua 15:47
Parallel
Joshua 15:47 also mentions the Great Sea as Judah's western border, identical to the boundary described here.
Numbers 34:6
Parallel
Numbers 34:6 commands the western border to be the Great Sea; here it is applied specifically to Judah's territory.
Deuteronomy 34:2
Parallel
In Deuteronomy 34:2, Moses sees the land of Judah extending to the western sea, exactly as described here.
Ezekiel 47:20
Parallel
In Ezekiel 47:20, the western border of the land is also the Great Sea, echoing the same geographic description.