Genesis 7:19

all the high mountains The account, given by P, describes the covering of the mountains of the whole earth by the waters of the Deluge. It is this hyperbolical description which has naturally seized upon the imagination of readers. It is not necessary to enlarge upon the physical impossibility of such an event. If the literal interpretation were adopted, the waters would have submerged not only the mountains of Western Asia and of Europe, but also the Andes and the Himalayas. Water at that height would have been ice: organic life would have been impossible. Geology has shewn that no such universal Deluge has ever occurred. The accumulation of the vast amount of water represented in such a scene and encompassing the whole globe is beyond the range of physical possibility.

Popular imagination working upon the tradition of a vast inundation in the Euphrates Valley lent itself to exaggeration.