Ezekiel 47:20
The west side also shall be the great sea from the border, till a man come over against Hamath. This is the west side.
Cross-reference
Numbers 34:6
Parallel
Numbers 34:6 states the western border is the Great Sea — identical to the western boundary described here.
Joshua 15:12
Parallel
Joshua 15:12 also sets Judah's western border as the Great Sea — a direct parallel to this western boundary.