Sea of Marmara at a glance
- 319 maverage depth
- 84 mmedian depth
- 1,273 mmaximum depth
- 10,831 km²water area
Sea of Marmara is a sea. Inside its outline the GEBCO grid has about 10,831 km² of water, with an average depth of about 319 m (the middle value is 84 m) and a maximum of 1,273 m, found at 40.75° N, 29.12° E.
Open the map at the deepest cell and tap to read the depth.
How deep is each part of the Sea of Marmara?
The bar splits the Sea of Marmara's water by depth. Each colour is a depth band, and the shares add up to 100%.
- 0 to 200 m: 60.1%
- 200 to 1,000 m: 29.8%
- 1,000 to 4,000 m: 10.1%
- 4,000 to 6,000 m: 0%
- below 6,000 m: 0%
Named features near the deepest point: Danube Canyon (373 km), Calypso Deep (835 km), Eratosthenes Seamount (848 km), Herodotus Basin (868 km).
The Sea of Marmara if sea level dropped
The slider on the map lowers the sea in steps. This table shows how much of the Sea of Marmara's water would be land at each step.
| Sea level lowered by | Becomes land | Share of its water |
|---|---|---|
| 10 m | 276 km² | 2.5% |
| 20 m | 623 km² | 5.7% |
| 50 m | 2,595 km² | 24% |
| 80 m | 5,275 km² | 48.7% |
| 120 m | 6,139 km² | 56.7% |
| 200 m | 6,514 km² | 60.1% |
| 500 m | 7,917 km² | 73.1% |
| 1,000 m | 9,739 km² | 89.9% |
| 2,000 m | 10,831 km² | 100% |
| 3,000 m | 10,831 km² | 100% |
| 4,000 m | 10,831 km² | 100% |
| 6,000 m | 10,831 km² | 100% |
A simple bathtub model: it lowers the sea everywhere by the same amount and does not simulate how water would really drain.
Nearby seas
- Aegean Sea average depth about 306 m
- Sea of Crete average depth about 696 m
- Black Sea average depth about 1,300 m
- Ionian Sea average depth about 2,122 m
- Sea of Azov average depth about 9 m
- Adriatic Sea average depth about 257 m
Nearest by the centre of each outline. All oceans and seas
Frequently asked questions
How deep is the Sea of Marmara?
On average about 319 m in the GEBCO grid (the middle value is 84 m). The deepest cell inside its outline is 1,273 m, at 40.75° N, 29.12° E.
How big is the Sea of Marmara?
About 10,831 km² of water inside its Natural Earth outline, counted from the grid cells that are below sea level.
How much of the Sea of Marmara would be land if sea level dropped?
With the sea 10 m lower, about 276 km² (2.5%) 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 sea. See data sources and licences. The GEBCO Grid should NOT be used for navigation or for any other purpose involving safety at sea.