To Sua Ocean Trench, a sea-filled crater in Samoa
Published on 09/04/2026 at 07:45 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS
On the south coast of Upolu in Samoa, To Sua Ocean Trench near Lotofaga turns a flat lawned plateau into a sudden drop of rock and clear sea water, a striking coastal crater shaped in lava and edged by tended gardens. This sea-filled basin is widely described as about 30 m (around 98 ft) deep, creating a substantial column of water below the grassy surface. The name “To Sua” is often translated as “big hole” or “giant swimming hole”, which fits the way the ground gives way here to reveal a steep-sided pool set just inland from the Pacific.
Lava rock, lawns and a vertical drop to the sea
To Sua Ocean Trench sits in a lava field close to the village of Lotofaga on the south coast of Upolu, one of Samoa’s main islands, where earlier eruptions left dark rock and blowholes along the shoreline.lava field close to the village of Lotofaga The trench itself forms a large, steep-sided opening in the ground with sea water at the bottom that is linked to the Pacific Ocean through passages in the surrounding rock, so that waves on the coast move the water in the pool.linked to the Pacific Ocean
From above, the surface presents tended lawns cut by paths, with the opening occupying a clear section of the plateau and vegetation spilling down the walls in patches of green against the darker lava.tended lawn cut by paths The salt water pool itself is described as roughly 30 m deep, and the figure appears in geological notes and travel guides alike.about 30 m deep A ladder leads down from the edge to a wooden platform near the water, turning the vertical drop into a stepped access route between the lawns above and the sea water below.steps lead down to a ladder
A coastal trench shaped by volcanic geology
Geological descriptions present To Sua as part of a broader set of karst and volcanic features on Samoa’s south-eastern coast, where lava flows and coastal erosion combine to produce holes, blowholes and tide pools in the rock.karst features of Samoa To Sua is described as consisting of two large holes joined by a lava tube cave, with the main hole forming the swimming pool and the second forming an adjacent depression connected underground.two large holes joined by a lava tube The main basin is filled with sea water, linked to the ocean by an underwater passage through the lava, so it shares the tides and swell of the nearby Pacific coast.
Accounts of the landscape refer to To Sua as a blue or turquoise swimming hole surrounded by lush greenery, with vegetation draping down the rock walls and gardens maintained around the rim.turquoise swimming hole surrounded by lush greenery The wider setting includes a lava field with blowholes and tide pools close to the shoreline, and beaches such as Fagaoneone nearby, where light-coloured sand lies beside darker volcanic rock.beach called Fagaoneone The combination of a tended lawn, a vertical sea trench and a rugged coastal lava landscape gives this part of Lotofaga a distinctive character.
Lotofaga, Upolu and the setting on Samoa’s south coast
To Sua Ocean Trench lies near Lotofaga on the south-eastern coast of Upolu, reached from Apia by following the island’s Main South Coast Road towards this part of the shore.Main South Coast Road towards this part of the shore Guides describe the approach as following the coast road and turning towards Lotofaga, where signs indicate the way to the lawns and entrance above the trench.follow Main South Coast Road, at Lotofaga turn south The surrounding land belongs to local families, who have developed paths, lawns and sitting areas around the crater, creating a garden-like setting above the raw volcanic rock.
Descriptions from Samoa’s tourism organisations and local lodges emphasise that To Sua Ocean Trench is located in Lotofaga village on the south coast of Upolu island in Samoa, and that its name refers directly to the large hole visible in the ground.located in Lotofaga village The pool’s depth is given as around 30 m in multiple accounts, aligning the local descriptions with external geological summaries.around 30 m deep With its mixture of village land, volcanic rock, maintained gardens and direct connection to the Pacific Ocean, To Sua Ocean Trench forms a clear focal point on this stretch of Samoa’s south coast.
Visiting To Sua Ocean Trench: what travellers from Western Europe should know
- To Sua Ocean Trench is near Lotofaga village on the south coast of Upolu island in Samoa, reached from Apia by following the Main South Coast Road towards the south-east.
- The opening drops from a lawned plateau down steep rock walls to sea water, with steps and a ladder forming a narrow and fairly steep access route.
- The wider setting includes lava rock, blowholes and tide pools near the shoreline, as well as nearby beaches such as Fagaoneone with light-coloured sand beside dark volcanic rock.
- The official language is Samoan and the currency is the Samoan tala.
- Entry requirements depend on your nationality; UK travellers can check the FCDO travel advice at gov.uk/foreign-travel-advice, Irish travellers the Department of Foreign Affairs at ireland.ie.
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Frequently asked questions about To Sua Ocean Trench
Where is To Sua Ocean Trench located?
To Sua Ocean Trench is near Lotofaga village on the south coast of Upolu island in Samoa, reached along the island’s Main South Coast Road.
What can visitors expect on a visit?
Visitors encounter a lawned plateau cut by paths, a large opening with steep rock walls, a ladder leading down to clear sea water and views of surrounding lava rock and coastal features.
What makes To Sua Ocean Trench distinctive?
The combination of a deep sea-filled crater about 30 m (around 98 ft) below a grassy surface, volcanic rock walls, gardens around the rim and a direct connection to the Pacific Ocean makes it distinctive.
