Did you know that San Alfonso del Mar Seawater, located in Algarrobo, Chile, is the largest and deepest swimming pool in the world?
San Alfonso’s pool is 1,000 meters (3/5 mile) long and up to 40 metres (130 ft) deep. The pool covers an area of 7.7 hectares (19 acres) that holds 250 million liters (66 million gallons) of seawater.
The pool, developed by Chilean company Crystal Lagoons, uses water pumped, filtered, and treated from the Pacific Ocean.
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 in annual maintenance.