To-Sua Ocean Trench

The To-Sua Ocean Trench is a breathtaking, 30-metre-deep natural swimming hole located in the village of Lotofaga on the south coast of Upolu Island, Samoa. Literally translating to "giant swimming hole," this iconic volcanic sinkhole is fed by crystal-clear saltwater moving through ancient underground lava tubes connected directly to the ocean. There is an entry charge to pay, cash is the recommended method.