Bible Meaning: None
The Bible does not contain the name "Mediterranean Sea" to describe the large body of water that delineated ancient Israel's western border. It, however, does use several phrases in the KJV that refer to the same thing.
Biblical synonyms for the Mediterranean Sea include "the sea" (Joshua 16:8, Numbers 13:29, Joshua 5:1, 11, 46, etc.) and "the great sea" (Numbers 34:6, Joshua 1:4, 9:1, 15:12, 23:4, Ezekiel 47:10, etc.). It was also known as "the uttermost (utmost) sea" (Deuteronomy 11:24, 34:2).
How big is it?
The Mediterranean covers a surface area of about 953,286 square miles (2.469 million square kilometers), making it the tenth largest body of water on the planet. Its water, from Gibraltar to the southeastern coast of Turkey (west to east), stretches roughly 2,500 miles (4,023 kilometers). Its current maximum depth of 17,280 feet (5,267 meters) is reached in the Ionian Sea part of the Mediterranean.
And I will set thy bounds from the Red sea even unto the sea of the Philistines (Mediterranean Sea), and from the desert unto the river: for I will deliver the inhabitants of the land into your hand; and thou shalt drive them out before thee.
The Amalekites dwell in the land of the south: and the Hittites, and the Jebusites, and the Amorites, dwell in the mountains: and the Canaanites dwell by the sea, and by the coast of Jordan.
And as for the western border, ye shall even have the great sea for a border: this shall be your west border.
Every place whereon the soles of your feet shall tread shall be yours: from the wilderness and Lebanon, from the river, the river Euphrates, even unto the uttermost sea shall your coast be.
Joshua 15:11 - 12
And the border went out unto the side of Ekron northward: and the border was drawn to Shicron, and passed along to mount Baalah, and went out unto Jabneel; and the goings out of the border were at the sea.
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.
Joshua 16:5, 8
And the border of the children of Ephraim according to their families was thus . . .
The border went out from Tappuah westward unto the river Kanah; and the goings out thereof were at the sea. This is the inheritance of the tribe of the children of Ephraim by their families.
They gave money also unto the masons, and to the carpenters; and meat, and drink, and oil, unto them of Zidon, and to them of Tyre, to bring cedar trees from Lebanon to the sea of Joppa (Mediterranean Sea), according to the grant that they had of Cyrus king of Persia.