San Alfonso del Mar 5.48

San Alfonso del Mar is a private resort in Algarrobo, Chile, about 100km west of Santiago. The resort has the world's largest swimming pool..The pool is 1013m long, covering 8ha, containing some 66e6USgal of seawater, with a maximum depth of 3.5052m. The water is pumped from the Pacific Ocean, filtered, and treated.DevelopmentThe pool was developed by Fernando Fischmann; his Chilean company Crystal Lagoons built the pool, which opened in December 2006. Early estimates put the total cost of construction at about US$3.5 million for the filtration system alone.