Add Yahoo as a preferred source to see more of our stories on Google. But how deep is each one? You’d have to dive hundreds of feet below the surface to reach the bottom of each. How many hundreds of ...

They contain 21% of the world's surface fresh water by volume. The total surface is 94,250 square miles (244,106 km2), and the total volume (measured at the low water datum) is 5,439 cubic miles ...