World's largest swimming pool

San Alfonso del Mar is a private resort located in Algarrobo, Chile, about 100 km (60 mi) west of the capital Santiago

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It is notable for having the Guinness world record for the largest and deepest swimming pool in the world

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It has been attracting tourists since it opened in December 2006.

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San Alfonso's pool is 1,000 meters (3/5 mile) long and up to 40 metres (130 ft) deep

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The pool covers an area of 7.7 hectares (19 acres) that holds 250 million liters (66 million gallons) of seawater

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The pool, developed by Chilean company Crystal Lagoons, uses water pumped, filtered, and treated from the Pacific Ocean to supply to the pool.

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While early estimates put the total cost of construction at about US$ 3.5 million (€2.8 million), more recent, and perhaps accurate estimates are in the area of $1.5 to 2 billion USD for construction and almost $4 million USD in annual maintenance

All photos: Splash/All Over Press

All photos: Splash/All Over Press