Genesis 7:20

Fifteen cubits upward did the waters prevail; and the mountains were covered. To think of a partial flood, of a local deluge, with this plain account before us were madness; for if the Deluge, after reaching its crest, stood on the earth for more than one hundred days and the ark did not settle on Mount Ararat until the waters subsided, then it stands to reason that it must have been a great deal higher than 16,000 feet, the height of Mount Ararat, and the fact that water seeks its own level would alone demand our belief in the universality of the Flood. Besides, the expression is very general: The mountains were covered; wherever they were on the entire surface of the earth, they were hidden by this mass of waters sent as a punishment by God.