The largest pool in the world is San Alfonso del Mar. It is 3,324 ft. long salt water lagoon at the San Alfonso del Mar resort in Algarrobo, Chile. It took 5 years to build and cost about 1.5 billion dollars (US).
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First World Hotel, Genting Highlands, Malaysia - 7,351The First Hotel hotel is part of the Resorts World Genting complex. Its two towers are home to 7,351 rooms, and it holds the Guinness World Records title for the largest hotel in the world.
Ready to go for a really deep swim? Deep Dive Dubai, the deepest swimming pool in the world, invites you to jump right in. Verified by Guinness World Records as the world's deepest pool, Deep Dive Dubai goes down to 60 meters (about 197 feet) and contains 14 million liters (roughly 3.7 million gallons) of water.