And God said, “Let the water under the sky be gathered to one place, and let dry ground appear.” And it was so. ¹⁰ God called the dry ground “land,” and the gathered waters he called “seas.” And God saw that it was good. 

(Genesis 1:9-10 -- NIV)

John MacArthur said, "If the moon did not remain in its exact distance from the earth, the ocean tide would inundate the land completely twice a day.  And after the first one, we wouldn't care about the second one."