וּגְב֣וּל יָ֔ם וְהָיָ֥ה לָכֶ֛ם הַיָּ֥ם הַגָּד֖וֹל וּגְב֑וּל זֶֽה־יִהְיֶ֥ה לָכֶ֖ם גְּב֥וּל יָֽם׃
און דער געמאַרק פֿון מערבֿ זאָל אײַך זײַן דער יַם-הַגָדול מיטן ברעג; דאָס זאָל אײַך זײַן דער געמאַרק פֿון מערבֿ.
Rashi
ים וגבול These words (apparently unconnected with what follows) mean: AND THE WESTERN BOUNDARY, what forms that?
Rashbam
(1) FOR THE WESTERN [LIT.: SEA] BOUNDARY. In other words, "And the western boundary, what is it? You shall have the Great Sea as the western boundar." (2) AND THE BORDER [UG'VUL]. Our Sages explained: to include the nesim in the sea, i.e., the islands of the sea (Esth. 10:1).
Rabbeinu Bahya
הים הגדול, “the Mediterranean,” known in the author’s time as “the Spanish Sea.” וגבול¸”and the western boundary.” The sea itself is the boundary. (Ibn Ezra).
Siftei Chakhamim
צוטריטלעך נאָר פֿאַר פּרעמיום־מיטגלידערRav Hirsch
צוטריטלעך נאָר פֿאַר פּרעמיום־מיטגלידערRashi
והיה לכם הים הגדול THE GREAT SEA SHALL BE UNTO YOU for the boundary.
Rashi
וגבול AND THE BOUNDARY — the נסין which are in the sea also belong to the boundary; they are what are called isles in O. F. (Gittin 8a).