San Alfonso del Mar

San Alfonso del Mar is a private resort in Algarrobo, Chile, about west of Santiago. The resort had one of the world's largest swimming pools. At the time of its completion in 2006, it was in the Guinness Book of World Records for the largest pool in the world by area.
The pool is long, covering , containing some of seawater, with a maximum depth of . The water is pumped from the adjacent Pacific Ocean, then filtered and treated. Access to the pool is limited to resort residents only.
Development.
Crystal Lagoons developed the lagoon, a company created by Fernando Fischmann in addition to Inmobiliaria El Plomo and the lead architects Marques + Garcés & Asociados Arquitectos Ltda.
The main details of the projects are: 
References.
Dueño de San Alfonso del Mar expande sus lagunas cristalinas
15 of the World's Largest Swimming Pools
About San Alfonso del Mar Project