Of the present world or the one that existed before the flood?
"Where the mountains of the world now tower to dizzy heights, oceans and plains once, millions of years ago, stretched out in flat monotony. . . . The movements of the continental plates cause the land both to rear up to heights where only the hardiest of animals and plants can survive and, at the other extreme, to plunge and lie in hidden splendor deep beneath the surface of the sea." - The Neck of the Giraffe, by Francis Hitching, 1982, p. 19.
"The average depth of all the seas has been estimated at 3,790 metres (12,430 feet), a figure considerably larger than that of the average elevation of the land above the sea level, which is 840 metres (2,760 feet). If the average depth is multiplied by its respective surface area, the volume of the World Ocean is 11 times the volume of the land above sea level." - The New Encyclopædia Britannica 1987, Vol. 25, p. 124.