Genesis 7:18

And they that went in, went in male and female of all flesh, as God had commanded him: and the LORD shut him in.

And the flood was forty days upon the earth; and the waters increased, and bare up the ark, and it was lift up above the earth.

And the waters prevailed exceedingly upon the earth; and all the high hills, that were under the whole heaven, were covered.

Fifteen cubits upward did the waters prevail; and the mountains were covered.