Ocean trench · Upolu
To Sua Ocean Trench
A 30-metre-deep collapsed lava tube on Upolu's south coast, fed by an underwater channel that lets the open Pacific flow in and out with the tide. A long wooden ladder spirals down to a small floating dock — the climb makes the swim feel earned. Surrounded by manicured native gardens with showers, picnic fales and a small mini-mart selling cold drinks. Skilled divers can swim through the cave passage to the open sea.
Also known as: Lotofaga Ocean Trench, To Sua, To Sua Lotofaga, To Sua Ocean Trench Samoa, To Sua Trench, To-Sua
To Sua Ocean Trench on YouTube
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Activities that visit To Sua Ocean Trench
7 tours include this stop on their itinerary.
Coconut Tours & Transport Samoa· 5.0★ (2)
- Day tour
- 6 to 7 hours
- Upolu
Alex N Lolos Transport & Tours· 4.0★ (1)
- Shore excursion
- 4 to 8 hours
- Upolu
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Visiting To Sua Ocean Trench — full guide
Stays nearby, activities that include To Sua Ocean Trench, practical info — all on one page.
Best stays in Upolu, Samoa
Upolu is where most Samoa trips start. Faleolo International Airport, the capital Apia, and the bulk of the country's resort-tier accommodation all sit here. The south coast (Lalomanu, Lotofaga, Siumu) is the postcard side; the north has Apia and the working harbour.
Things to do in Samoa: tours, activities, and day trips
Samoa rewards travellers who get out of the resort. Most of the iconic photos (To-Sua, Lalomanu, Alofaaga blowholes, the canopy walk) are 60–90-minute drives from wherever you're staying — and the easiest way to see them is on a guided tour with a local operator who knows the village fees and the best swimming windows.
Stay nearby on Upolu
About To Sua Ocean Trench
Is there an entry fee?
Most Samoan waterfalls, natural pools, and caves sit on village or family land and charge a small access fee (typically WST 5-30) paid at the entrance. Bring small notes.
Can I swim here?
Most freshwater pools at the base of waterfalls are swimmable when water levels are reasonable; rope swings or ladders may be present. Swim at your own risk — there are no lifeguards, and rocks can be slippery. After heavy rain, swimming may be unsafe due to debris and stronger currents.
When is the best time to visit?
Morning to early afternoon for the best light and photography. Avoid visits during or just after heavy rain when access tracks can be slippery and pools turbid.
What should I bring?
Reef shoes or sandals with grip, swimwear, towel, drinking water, a small denomination of cash for the entry fee, and insect repellent.
Last updated 29 May 2026