Targum Onkelos: And the Lord said, The waters shall be collected under the heavens into one region, and the dry land shall appear. And it was so.
Rashi: Let the water…gather: They were spread out over the surface of the entire earth, and He gathered them in the ocean, [the Mediterranean], which is the largest of all the seas. — [from Pirkei d’Rabbi Eliezer, ch. 5; Gen. Rabbah 5:2]
Rambam: God thoughtfully willed that, below the heaven, the mixture of water and earth should be separated by the water gathering in one place, even though its nature is to cover all that is around it; by the earth rising above the water, even though its nature is to sink; and by the earth’s drying out; and it is so forever.
Ibn Ezra: For God had already commanded, “Let the waters come together into the sea that surrounds the earth and let the previously hidden dry land be seen.” Since this had already become so,