This is from last year but its what I've read several different places.

The Guarani Aquifer in South America is a huge underground reservoir that lies under Paraguay, Uruguay, Argentina and Brazil, covering an area of land the size of Texas and California combined.

The aquifer contains enough fresh water to sustain the world’s population for 200 years

George W Bush owns a huge ranch on the aquifer which some activists are interpreting as an American neo-imperialist threat to South America’s sovereignty

[link to blogs.ei.columbia.edu]