But, there is one pool that will likely never be covered and not because it is not in the northern hemisphere --
but because it is sooooooo big!
Where is it? and How big is it?
Your first question is easy to answer. It is in Chile!
But, as to its size ---
Well, again, a picture is worth a thousand words so we will not try to describe the size but will just simply say, check out these pictures. HERE'S THE LINK
