The World’s 20 Most Beautiful Natural Swimming Pools

16. To Sua Ocean Trench, Lotofaga, Samoa
A huge basaltic shield volcano formed this lake. To Sua Ocean Trench is an all-natural swimming hole complete with a nature-made ladder and a dock! Located in Samoa’s Lotofaga Village on Upolu Island, the pool is populated with fish, crabs and other marine life.

Despite its astounding depth and size, To Sua is hard to witness as you approach surrounding parkland. The main hole, or pool, is filled with seawater and connected to the ocean by an underwater cave, which explains why it is populated with rich marine life. The pool is fed by a series of tunnels and cannels with water from the ocean just meters away.

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