Clear blue water and greenery overhang over the To Sua Ocean Trench in the village of Lotofoga Samoa. steps lead down to a ladder, which tourists can use to descend into the grotto, or use as an impromptu diving board (providing the water levels are high enough). The pool is maintained by water flowing in from the South Pacific Ocean through a number of channels and tunnels the trench in Samoa is on volcanic island of Upolu.
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