Inner Seas at a glance
- 80 maverage depth
- 72 mmedian depth
- 313 mmaximum depth
- 40,355 km²water area
Inner Seas is a sea. Inside its outline the GEBCO grid has about 40,355 km² of water, with an average depth of about 80 m (the middle value is 72 m) and a maximum of 313 m, found at 57.51° N, 5.96° W.
Open the map at the deepest cell and tap to read the depth.
How deep is each part of the Inner Seas?
The bar splits the Inner Seas's water by depth. Each colour is a depth band, and the shares add up to 100%.
- 0 to 200 m: 99.3%
- 200 to 1,000 m: 0.7%
- 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: Hebrides Terrace Seamount (286 km), Anton Dohrn Seamount (301 km), Beaufort's Dyke (304 km), Rosemary Bank (328 km).
The Inner Seas if sea level dropped
The slider on the map lowers the sea in steps. This table shows how much of the Inner Seas's water would be land at each step.
| Sea level lowered by | Becomes land | Share of its water |
|---|---|---|
| 10 m | 1,197 km² | 3% |
| 20 m | 2,634 km² | 6.5% |
| 50 m | 10,844 km² | 26.9% |
| 80 m | 22,747 km² | 56.4% |
| 120 m | 32,614 km² | 80.8% |
| 200 m | 40,088 km² | 99.3% |
| 500 m | 40,355 km² | 100% |
| 1,000 m | 40,355 km² | 100% |
| 2,000 m | 40,355 km² | 100% |
| 3,000 m | 40,355 km² | 100% |
| 4,000 m | 40,355 km² | 100% |
| 6,000 m | 40,355 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
- Irish Sea average depth about 52 m
- North Sea average depth about 78 m
- Kattegat average depth about 27 m
- Bay of Biscay average depth about 1,919 m
- Norwegian Sea average depth about 1,684 m
- Baltic Sea average depth about 66 m
Nearest by the centre of each outline. All oceans and seas
Frequently asked questions
How deep is the Inner Seas?
On average about 80 m in the GEBCO grid (the middle value is 72 m). The deepest cell inside its outline is 313 m, at 57.51° N, 5.96° W.
How big is the Inner Seas?
About 40,355 km² of water inside its Natural Earth outline, counted from the grid cells that are below sea level.
How much of the Inner Seas would be land if sea level dropped?
With the sea 10 m lower, about 1,197 km² (3%) 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.