The largest Swimming pool ever built along the spectacular sea view of Koh Kong beach. The world's largest swimming pool can be found at a seaside resort in Algarrobo, Chile, 95 km west of Santiago. Acknowledged by the Guinness World Records, the lagoon measures 1013 metres in length, covers an area of eight hectares, contains 250,000 cubic meters of water and is navigable in small boats. Here’s our top 10, from the most relaxing pool in the world to a mad Las Vegas water-world.