Ocean Floor Map

Antongila Bay depth map

Bay: average depth about 42 m, deepest 147 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

Drain the oceans

  • 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.

Antongila Bay at a glance

  • 42 maverage depth
  • 44 mmedian depth
  • 147 mmaximum depth
  • 2,587 km²water area

Antongila Bay is a bay. Inside its outline the GEBCO grid has about 2,587 km² of water, with an average depth of about 42 m (the middle value is 44 m) and a maximum of 147 m, found at 15.96° S, 50.01° E.

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

How deep is each part of the Antongila Bay?

The bar splits the Antongila Bay's water by depth. Each colour is a depth band, and the shares add up to 100%.

  • 0 to 200 m: 100%
  • 200 to 1,000 m: 0%
  • 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: Fani Maoré (599 km), Mascarene Plateau (1,264 km), Central Indian Ridge (2,127 km), Wangdayuan Seamount (2,148 km).

The Antongila Bay if sea level dropped

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

Sea level lowered byBecomes landShare of its water
10 m76 km²2.9%
20 m453 km²17.5%
50 m1,560 km²60.3%
80 m2,544 km²98.3%
120 m2,584 km²99.9%
200 m2,587 km²100%
500 m2,587 km²100%
1,000 m2,587 km²100%
2,000 m2,587 km²100%
3,000 m2,587 km²100%
4,000 m2,587 km²100%
6,000 m2,587 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 Antongila Bay?

On average about 42 m in the GEBCO grid (the middle value is 44 m). The deepest cell inside its outline is 147 m, at 15.96° S, 50.01° E.

How big is the Antongila Bay?

About 2,587 km² of water inside its Natural Earth outline, counted from the grid cells that are below sea level.

How much of the Antongila Bay would be land if sea level dropped?

With the sea 10 m lower, about 76 km² (2.9%) 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 bay. See data sources and licences. The GEBCO Grid should NOT be used for navigation or for any other purpose involving safety at sea.

All oceans and seas · Undersea features · Drain the oceans

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