San Alfonso del Mar

San Alfonso del Mar, sometimes spelled "San Alphonso del Mar", is a private resort in Algarrobo, Chile, about 100 km west of Santiago.

Facilities

 * 1,200 second home units.
 * Sub-Acqua Café Aquarium, located on the edge of the artificial lagoon.
 * Beach Club, consisting of a gym, spa, shop, kiosk-bar, outdoor jacuzzis, and a heated swimming pool covered by a glass pyramid.
 * Nightclub, an underground building on the side of a hill with a sunken dance floor, bar, and DJ.
 * Fragata Building, a pyramid-shaped building with 141 apartments.
 * Bitácora Building, with a total of 60 apartments.

Artificial lagoon
The resort has 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 1013 m long, covering 8.2 ha, containing some 66 e6USgal of seawater, with a maximum depth of 3.5 m. The water is pumped from the adjacent Pacific Ocean, then filtered and treated. Access to the pool is limited to resort residents only.

Crystal Lagoons, a company created by Fernando Fischmann in addition to Inmobiliaria El Plomo and the lead architects Marques + Garcés & Asociados Arquitectos, developed the lagoon.