World's largest pool

Courtesy of Mr. Blass-
Already drawing the crowds in the South American resort of San Alfonso del Mar in Chile, this artificial lagoon and swimming pool is eight hectares in size and contains an incredible 250,000 cubic metres of water. Acknowledged by Guinness World Records as being the world’s largest swimming pool, the lagoon trounces all other record holders in the category, including the Orthlieb pool in Casablanca, Morocco, itself a huge 150 metres by 100 metres – the San Alfonso pool is 1km in length. The revolutionary clear water artificial lagoons, transparent to a depth of 35 metres and unprecedented in design and construction methods, are the brainchild of Crystal Lagoons founder, biochemist and Chilean businessman Fernando Fischmann. Equivalent in size to an incredible 6,000 standard domestic pools, details of its technology are to be unveiled for the first time at Cityscape Dubai later this month.

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an update 3/11/2009: more pics: