The World's Largest Pool! The Crystal Lagoon, located at the San Alfonso del Mar resort in Algarrobo, Chile, is the world's largest outdoor pool, stretching more than half of a mile and filled with 66 million gallons of water.
The Reethi Rah Resort in the Maldives might have more than 50 pools on the property. But this adults-only lap pool is especially lovely. It's kind of hard to tell where the pool ends and where the ocean begins.