Chile has been awarded the Guinness World Record for the largest swimming pool on the planet.

The gigantic lagoon is located in the resort of San Alfonso del Mar in Algarrobo city, on the southern coast of Chile.Guinness Book of World Records has named it the largest pool in the world. How big is it? One over a kilometer long (3,323 feet), covering 20 acres and containing 250,000 cubic meters of water.

The ocean water is too cold most of the year and the pool is kept at a refreshing 79 degrees during the summer.

While there is plenty of room to swim in the pool, visitors can also cruise across the lagoon on small boats.

The pool took five years to build, cost nearly £1billion and the annual maintenance bill will be £2million. It can harvest, filter and permanently recirculate ocean water by itself.

The man-made saltwater lagoon has been attracting huge crowds to the San Alfonso del Mar resort at Algarrobo since it opened last month. Its turquoise waters are so crystal clear that you can see the bottom even in the deep end.