
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
Recent visitor videos

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Activities that visit To Sua Ocean Trench
10 tours include this stop on their itinerary.

Samoa Upolu: Full Day Private Tour
SummerWind Samoa· 5.0★ (2)
- Day tour
- 7 hours 30 minutes
- Upolu

The Pristine Waters of Upolu
Samoan Island Adventures· 4.9★ (54)
- Day tour
- 7 to 9 hours
- Upolu

Guided Tour to Primeval Crystal Waters of Samoa
Samoan Island Adventures· 4.9★ (20)
- Adventure
- 9 hours
- Upolu

Upolu Island Tours with Coconut Tours Samoa
Coconut Tours & Transport Samoa· 5.0★ (2)
- Day tour
- 6 to 7 hours
- Upolu

AlexNLolos Apia Samoa Shore Excursion
Alex N Lolos Transport & Tours· 4.0★ (1)
- Shore excursion
- 4 to 8 hours
- Upolu

Private Day Shore Tour: Samoa's Waterfalls, Beach & Culture
Samoa Private Tours
- Shore excursion
- 7 hours
- Upolu

Samoa Apia: Cruise Ship Shore Excursion
SummerWind Samoa· 5.0★ (2)
- Shore excursion
- 6 hours 30 minutes
- Upolu

Private Shore Tour Samoa's Natural Wonders
Samoa Private Tours
- Shore excursion
- 7 hours
- Upolu

Samoa in a Day: Customizable Tour of Beaches, Waterfalls, Culture
Matua Tours· 4.9★ (16)
- Day tour
- 5 to 8 hours
- Upolu

Namua Turtle Island and Eastern Upolu Tour
Chief Tai Tours· 4.9★ (30)
- Day tour
- 6 to 7 hours
- Upolu
Featured in our guides
Dedicated guide
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
Last updated 6 May 2026




