Bass Strait at a glance
- 84 maverage depth
- 66 mmedian depth
- 2,739 mmaximum depth
- 105,744 km²water area
Bass Strait is a strait. Inside its outline the GEBCO grid has about 105,744 km² of water, with an average depth of about 84 m (the middle value is 66 m) and a maximum of 2,739 m, found at 38.58° S, 148.85° E.
Open the map at the deepest cell and tap to read the depth.
How deep is each part of the Bass Strait?
The bar splits the Bass Strait's water by depth. Each colour is a depth band, and the shares add up to 100%.
- 0 to 200 m: 97.6%
- 200 to 1,000 m: 1.6%
- 1,000 to 4,000 m: 0.9%
- 4,000 to 6,000 m: 0%
- below 6,000 m: 0%
Named features near the deepest point: Browns Mountain (566 km), Tasmanian Seamounts (654 km), Gascoyne Seamount (682 km), Tasman Fracture (757 km).
The Bass Strait if sea level dropped
The slider on the map lowers the sea in steps. This table shows how much of the Bass Strait's water would be land at each step.
| Sea level lowered by | Becomes land | Share of its water |
|---|---|---|
| 10 m | 2,272 km² | 2.1% |
| 20 m | 5,445 km² | 5.1% |
| 50 m | 26,263 km² | 24.8% |
| 80 m | 91,075 km² | 86.1% |
| 120 m | 102,037 km² | 96.5% |
| 200 m | 103,155 km² | 97.6% |
| 500 m | 104,268 km² | 98.6% |
| 1,000 m | 104,807 km² | 99.1% |
| 2,000 m | 105,280 km² | 99.6% |
| 3,000 m | 105,744 km² | 100% |
| 4,000 m | 105,744 km² | 100% |
| 6,000 m | 105,744 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
- Great Australian Bight average depth about 3,184 m
- Tasman Sea average depth about 3,360 m
- Coral Sea average depth about 2,553 m
- Gulf of Carpentaria average depth about 41 m
- Solomon Sea average depth about 2,825 m
- Timor Sea average depth about 466 m
Nearest by the centre of each outline. All oceans and seas
Frequently asked questions
How deep is the Bass Strait?
On average about 84 m in the GEBCO grid (the middle value is 66 m). The deepest cell inside its outline is 2,739 m, at 38.58° S, 148.85° E.
How big is the Bass Strait?
About 105,744 km² of water inside its Natural Earth outline, counted from the grid cells that are below sea level.
How much of the Bass Strait would be land if sea level dropped?
With the sea 10 m lower, about 2,272 km² (2.1%) 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 strait. See data sources and licences. The GEBCO Grid should NOT be used for navigation or for any other purpose involving safety at sea.