Genesis 7:20 in the King James Version
Fifteen cubits upward did the waters prevail; and the mountains were covered.
Context
19 The waters rose very high on the earth. All the high mountains that were under the whole sky were covered.
20 The waters rose fifteen cubits higher, and the mountains were covered.
21 All flesh died that moved on the earth, including birds, livestock, animals, every creeping thing that creeps on the earth, and every man.