Ocean Floor Map

Gulf of Saint Lawrence depth map

Gulf: average depth about 163 m, deepest 900 m (GEBCO_2026 grid).

Tap or scroll to load the interactive map

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.

Gulf of Saint Lawrence at a glance

  • 163 maverage depth
  • 107 mmedian depth
  • 900 mmaximum depth
  • 235,994 km²water area

Gulf of Saint Lawrence is a gulf. Inside its outline the GEBCO grid has about 235,994 km² of water, with an average depth of about 163 m (the middle value is 107 m) and a maximum of 900 m, found at 49.87° N, 61.23° W.

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

How deep is each part of the Gulf of Saint Lawrence?

The bar splits the Gulf of Saint Lawrence's water by depth. Each colour is a depth band, and the shares add up to 100%.

  • 0 to 200 m: 66.3%
  • 200 to 1,000 m: 33.7%
  • 1,000 to 4,000 m: 0%
  • 4,000 to 6,000 m: 0%
  • below 6,000 m: 0%

Named features near the deepest point: The Heart (576 km), St Anthony Basin (582 km), The Cow Pen (613 km), The Bull Pen (617 km).

The Gulf of Saint Lawrence if sea level dropped

The slider on the map lowers the sea in steps. This table shows how much of the Gulf of Saint Lawrence's water would be land at each step.

Sea level lowered byBecomes landShare of its water
10 m8,130 km²3.4%
20 m18,301 km²7.8%
50 m51,720 km²21.9%
80 m97,154 km²41.2%
120 m125,098 km²53%
200 m156,481 km²66.3%
500 m234,731 km²99.5%
1,000 m235,994 km²100%
2,000 m235,994 km²100%
3,000 m235,994 km²100%
4,000 m235,994 km²100%
6,000 m235,994 km²100%

A simple bathtub model: it lowers the sea everywhere by the same amount and does not simulate how water would really drain.

Nearby seas

Nearest by the centre of each outline. All oceans and seas

Frequently asked questions

How deep is the Gulf of Saint Lawrence?

On average about 163 m in the GEBCO grid (the middle value is 107 m). The deepest cell inside its outline is 900 m, at 49.87° N, 61.23° W.

How big is the Gulf of Saint Lawrence?

About 235,994 km² of water inside its Natural Earth outline, counted from the grid cells that are below sea level.

How much of the Gulf of Saint Lawrence would be land if sea level dropped?

With the sea 10 m lower, about 8,130 km² (3.4%) of its water would be land. At 6,000 m lower, 100% would be. This is a simple bathtub model that lowers the sea evenly everywhere.

Data: depths from the GEBCO_2026 grid, statistics worked out inside the Natural Earth outline of the gulf. 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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