The Crystal Lagoon at San Alfonso del Mar resort, Chile, halfway up the country’s Pacific coast, in the city of Algarrobo. The man-made lagoon is filled with 66 million gallons of crystal clear seawater. It is more than 1,000 yards long, covers 20 acres and has a 115-foot deep end. The Guinness Book of Records has named it the biggest outdoor pool in the world.
http://www.dailymail.co.uk/news/article-2147443/Worlds-biggest-pool-holds-66-million-gallons.html
http://twistedsifter.com/2012/05/worlds-largest-swimming-pool-san-alfonso-del-mar/
http://www.chilloutpoint.com/featured/the-biggest-swimming-pool-in-the-world.html
http://www.victory-cruises.com/pool.html
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http://www.ibtimes.co.uk/world-s-largest-pool-chile-wows-tourists-343426
