Largest Swimming Pool in the World, Algarrobo, Chile. It covers 20 acres.Algarrobo is a Chilean city and commune in San Antonio Province, Valparaíso Region. Located on the country's central coast, it is a popular summer resort for the population of Santiago. It is an upscale community near El Quisco and Valparaíso.
The San Alfonso del Mar resort, located north of the city, is home to the world's largest outdoor pool.
According to the 2002 census of the National Statistics Institute, Algarrobo spans an area of 175.6 km2 (68 sq mi) and has 8,601 inhabitants (4,369 men and 4,232 women). Of these, 6,628 (77.1%) lived in urban areas and 1,973 (22.9%) in rural areas. The population grew by 44.1% (2,633 persons) between the 1992 and 2002 censuses