Upon the land. - The land is to be understood of the portion of the earth's surface known to man. This, with an unknown margin beyond it, was covered with the waters. But this is all that Scripture warrants us to assert. Concerning the distant parts of Europe, the continents of Africa, America, or Australia, we can say nothing. "All the high hills were covered." Not a hill was above water within the horizon of the spectator or of man. There were ten generations from Adam to Noah inclusive. We cannot tell what the rate of increase was. But, supposing each couple to have ten children, and therefore the common ratio to be five, the whole number of births would be about five million, and the population in the time of Noah less than four million. It is probable that they did not scatter further than the necessities and conveniences of life demanded. In a fertile region, an area equal to that of the British Isles would be amply sufficient for four million men, women, and children.

Let us suppose, then, a circle of five hundred miles in diameter inhabited by man. Let this occupy the central region of a concentric circle of eight hundred miles in diameter. With a center a little southwest of Mosul, this larger circle would reach fifty miles into the Mediterranean, the Euxine, and the Caspian, and would probably have touched the Persian Gulf at the time of the deluge. If this region were covered with water, it is obvious that no land or mountain would be visible to a spectator within the inner circle of five hundred miles in diameter. "Fifteen cubits upward." This was half the depth of the ark. It may have taken this draught of water to float it. If so, its grounding on a hill under water would indicate the depth of water on its summit. The gradual rise of the waters was accomplished by the depression of the land, aided, possibly, by a simultaneous elevation of the bed of the ocean. The water, by the mere necessity of finding its level, overflowed the former dry land. The extent of this oscillation of the solid crust of the earth is paralleled by the changes of level which geology indicates, the last of which took place at the time of the six days' creation. It is possible that most of the land that was then raised was now again temporarily submerged in the returning waters; while distant continents may have all along existed, which never came within the ken of antediluvian man. The sobriety and historical veracity of the narrative are strikingly exhibited in the moderate height to which the waters are said to have risen above the ancient hills.

And the waters prevailed exceedingly on the earth,.... Yet more and more, so that the people without the ark were obliged to remove, not only from the lower to the higher rooms in their houses, and to the tops of them, but to the highest trees; and when these were bore down, to the highest hills and mountains; and to those it was in vain to fly, by what follows:

and all the high hills that were under the whole heaven were covered: whence it appears there were hills before the flood, and that these were not caused by it, and that the deluge was universal, since there was not a hill under the whole heaven but what was covered with it. In Deucalion's flood all men are said to perish, except a few who fled to the high mountains (n); which story seems to be hammered out of this account.

(n) Apollodorus, de Deor. Origin. l. 1. p. 19.

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

7:17-20 The flood was increasing forty days. The waters rose so high, that the tops of the highest mountains were overflowed more than twenty feet. There is no place on earth so high as to set men out of the reach of God's judgments. God's hand will find out all his enemies, Ps 21:8. When the flood thus increased, Noah's ark was lifted up, and the waters which broke down every thing else, bore up the ark. That which to unbelievers betokens death unto death, to the faithful betokens life unto life.