Numbers 34:6

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 of Tiberias:

this shall be your west border;
namely, the Mediterranean sea.