“For the western border, you shall have the Great Sea and its coast. This shall be your western border.
And as for the western border,.... Of the land of Canaan: you shall even have the great sea for a border; and no other, meaning the Mediterranean sea, which lies west of the land of Judea; Aben Ezra calls it the Spanish sea: it has the name of "great", in comparison of some in the land of Canaan, as the salt sea, and the sea...
the western border--There is no uncertainty about this boundary, as it is universally allowed to be the Mediterranean, which is called "the great sea" in comparison with the small inland seas or lakes known to the Hebrews.
And [as for] the western border, ye shall even have the great sea for a border: this shall be your west border. (c) Which is called the Mediterranean.