Holly crap.i just found this largest swimming pool in da world !! 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. How big is it? One over a kilometer long (3,323 feet), covering 20 acres and containing 250,000 cubic meters of water.