Great Australian Bight at a glance
- 3,184 maverage depth
- 4,225 mmedian depth
- 5,981 mmaximum depth
- 1.2 million km²water area
Great Australian Bight is a gulf. Inside its outline the GEBCO grid has about 1.2 million km² of water, with an average depth of about 3,184 m (the middle value is 4,225 m) and a maximum of 5,981 m, found at 39.15° S, 133.61° E.
Open the map at the deepest cell and tap to read the depth.
How deep is each part of the Great Australian Bight?
The bar splits the Great Australian Bight's water by depth. Each colour is a depth band, and the shares add up to 100%.
- 0 to 200 m: 26.1%
- 200 to 1,000 m: 4.4%
- 1,000 to 4,000 m: 17.6%
- 4,000 to 6,000 m: 51.9%
- below 6,000 m: 0%
Named features near the deepest point: Tasman Fracture (1,093 km), Tasmanian Seamounts (1,248 km), Browns Mountain (1,706 km), Perth Canyon (1,858 km).
The Great Australian Bight if sea level dropped
The slider on the map lowers the sea in steps. This table shows how much of the Great Australian Bight's water would be land at each step.
| Sea level lowered by | Becomes land | Share of its water |
|---|---|---|
| 10 m | 3,076 km² | 0.2% |
| 20 m | 7,881 km² | 0.6% |
| 50 m | 66,245 km² | 5.4% |
| 80 m | 208,745 km² | 16.9% |
| 120 m | 295,702 km² | 24% |
| 200 m | 321,099 km² | 26.1% |
| 500 m | 338,932 km² | 27.5% |
| 1,000 m | 375,734 km² | 30.5% |
| 2,000 m | 457,453 km² | 37.1% |
| 3,000 m | 515,667 km² | 41.9% |
| 4,000 m | 592,701 km² | 48.1% |
| 6,000 m | 1.2 million 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
- Tasman Sea average depth about 3,360 m
- Gulf of Carpentaria average depth about 41 m
- Timor Sea average depth about 466 m
- Coral Sea average depth about 2,553 m
- Savu Sea average depth about 1,867 m
- Arafura Sea average depth about 191 m
Nearest by the centre of each outline. All oceans and seas
Frequently asked questions
How deep is the Great Australian Bight?
On average about 3,184 m in the GEBCO grid (the middle value is 4,225 m). The deepest cell inside its outline is 5,981 m, at 39.15° S, 133.61° E.
How big is the Great Australian Bight?
About 1.2 million km² of water inside its Natural Earth outline, counted from the grid cells that are below sea level.
How much of the Great Australian Bight would be land if sea level dropped?
With the sea 50 m lower, about 66,245 km² (5.4%) 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.