Joshua 15:12
The western border was the Mediterranean Sea. These were the borders of the tribe of Judah and its clans.
Numbers 34:6-7
"'And for a western border you will have the Great Sea. This will be your western border.
Joshua 15:47
Ashdod with its surrounding towns and settlements, and Gaza with its surrounding towns and settlements, as far as the Stream of Egypt and the border at the Mediterranean Sea.
Ezekiel 47:20
On the west side the Great Sea will be the boundary to a point opposite Lebo-hamath. This is the west side.
Deuteronomy 11:24
Every place you set your foot will be yours; your border will extend from the desert to Lebanon and from the River (that is, the Euphrates) as far as the Mediterranean Sea.