Ocean Floor Map

Romanche Fracture Zone map

Fracture zone: 4,556 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.

Romanche Fracture Zone at a glance

  • 4,556 mdeep in the grid
  • Fracture zonetype of feature
  • 0.43° S, 19.60° Wlisted point
  • Saint Helenanearest country, about 1,007 km
  • 9 of 29deepest of the fracture zones in our list

Romanche Fracture Zone is a fracture zone. In the GEBCO grid it reaches 4,556 m below sea level. That figure is the depth in the grid at its listed centre point, so a typical depth for the feature, not its deepest or shallowest point. The nearest country in our list is Saint Helena, about 1,007 km from its listed point.

Open the main map at its listed point and tap anywhere to read the depth.

How deep is the Romanche Fracture Zone?

The grid figure is 4,556 m. We measured it as the depth in the grid at its listed centre point, so a typical depth for the feature, not its deepest or shallowest point. 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 has no depth figure for this feature, so the grid is our only source for it.

Among the 29 fracture zones in our list it ranks 9th by depth. The list is the named features on Wikidata with a position at sea, so it is not every fracture zone in the world.

About fracture zones

A fracture zone is a long scar in the seabed, where blocks of ocean crust on either side of a ridge have slid past each other.

This site lists 29 fracture zones, 17 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 fracture zones in our list

Frequently asked questions

How deep is the Romanche Fracture Zone?

In the GEBCO grid the figure is 4,556 m. That is the depth in the grid at its listed centre point, so a typical depth for the feature, not its deepest or shallowest point.

Where is the Romanche Fracture Zone?

Its listed point is 0.43° S, 19.60° W, about 1,007 km from Saint Helena.

Data: depth from the GEBCO_2026 grid. Name and position from Wikidata Q23925950 (CC0). 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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