San Alfonso del Mar seawater pool in Algarrobo, Chile has been named the world's largest outdoor swimming pool by the Guiness Book of World Records. This artificial lagoon and swimming pool is eight hectares in size and contains an incredible 250,000 cubic meters of water.
Chile's monster pool uses a computer- controlled suction and filtration system to keep fresh seawater in permanent circulation, drawing it in from the ocean at one end and pumping it out at the other. Its turquoise waters are so crystal clear that you can see the bottom even in the deep end.

If you like doing laps in the swimming pool, you might want to stock up on the energy drinks before diving in to this one!!!

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>Source: Crystal Lagoons