Ocean Floor Map

Tonga Trench map: how deep is it?

Oceanic trench: 10,755 m down (GEBCO_2026 grid).

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Sea level todayDrag the slider to lower the sea and see the land that would appear.

Sea level in metres below today’s. A simple bathtub model: it lowers the sea everywhere by the same amount and does not simulate how the water would really drain.

Key

Sea depth

  • Deeper than 6,000 m
  • 4,000 to 6,000 m
  • 2,000 to 4,000 m
  • 1,000 to 2,000 m
  • 200 to 1,000 m
  • Shallower than 200 m (the continental shelf)

Land height

  • Land up to 500 m
  • 500 to 2,000 m
  • Above 2,000 m

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  • Seabed exposed when the sea is lowered A dashed white line marks today’s coast.

How to read the map. Darker blue is deeper water. Tap anywhere to see how deep the sea is there, or how high the land is, and the nearest named undersea feature. Depths come from the GEBCO_2026 grid, which in most of the deep ocean is predicted from satellite measurements of the sea surface rather than surveyed by ship, and the map’s tiles are coarser than the grid, so narrow trenches read shallower on the map than their true depth. Not for navigation.

Tonga Trench at a glance

  • 10,755 mdeep in the grid
  • Oceanic trenchtype of feature
  • 20.00° S, 173.00° Wlisted point
  • Tonganearest country, about 135 km
  • 10,817 mWikidata's own depth
  • 2 of 39deepest of the trenches in our list

Tonga Trench is an oceanic trench. In the GEBCO grid it reaches 10,755 m below sea level. That figure is the deepest cell in the grid within 400 km of the centre point Wikidata gives for it (a trench is very long, and Wikidata lists a single point). The nearest country in our list is Tonga, about 135 km from its listed point.

Open the main map at the deepest cell and tap anywhere to read the depth.

How deep is the Tonga Trench?

The grid figure is 10,755 m. We measured it as the deepest cell in the grid within 400 km of the centre point Wikidata gives for it (a trench is very long, and Wikidata lists a single point). The cell is at 23.20° S, 174.74° W. The GEBCO_2026 grid has a value every 15 arc-seconds, about 460 m at the equator, so a very narrow feature can be a little deeper or shallower in reality than any grid cell shows.

Wikidata, the open database this feature's name comes from, gives a depth of 10,817 m. That is within 62 m of the grid figure.

Among the 39 trenches in our list it ranks 2nd by depth. The list is the named features on Wikidata with a position at sea, so it is not every oceanic trench in the world.

About trenches

Oceanic trenches are long, narrow valleys where one tectonic plate slides beneath another. They hold the deepest water on Earth, and most lie around the edge of the Pacific Ocean.

This site lists 39 trenches, 31 of them with their own indexed page. See all undersea features.

Nearby undersea features

Distances are between listed points. A long feature such as a trench or ridge has a single listed point on Wikidata.

The deepest trenches in our list

Frequently asked questions

How deep is the Tonga Trench?

In the GEBCO grid the figure is 10,755 m. That is the deepest cell in the grid within 400 km of the centre point Wikidata gives for it (a trench is very long, and Wikidata lists a single point). Wikidata, the open database this feature's name comes from, gives a depth of 10,817 m. That is within 62 m of the grid figure.

Where is the Tonga Trench?

Its listed point is 20.00° S, 173.00° W, about 135 km from Tonga. The grid's deepest cell for it is at 23.20° S, 174.74° W.

Data: depth from the GEBCO_2026 grid. Name and position from Wikidata Q119294 (CC0); Wikipedia article. See data sources and licences. The GEBCO Grid should NOT be used for navigation or for any other purpose involving safety at sea.

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