Ocean Floor Map

Hangzhou Bay depth map

Bay: average depth about 10 m, deepest 114 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.

Hangzhou Bay at a glance

  • 10 maverage depth
  • 8 mmedian depth
  • 114 mmaximum depth
  • 6,551 km²water area

Hangzhou Bay is a bay. Inside its outline the GEBCO grid has about 6,551 km² of water, with an average depth of about 10 m (the middle value is 8 m) and a maximum of 114 m, found at 29.99° N, 121.94° E.

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

How deep is each part of the Hangzhou Bay?

The bar splits the Hangzhou 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: Hatoma Knoll (600 km), Iriomote Submarine Volcano (633 km), Unnamed volcano (666 km), Ryukyu Trench (835 km).

The Hangzhou Bay if sea level dropped

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

Sea level lowered byBecomes landShare of its water
10 m4,832 km²73.7%
20 m6,112 km²93.3%
50 m6,468 km²98.7%
80 m6,524 km²99.6%
120 m6,551 km²100%
200 m6,551 km²100%
500 m6,551 km²100%
1,000 m6,551 km²100%
2,000 m6,551 km²100%
3,000 m6,551 km²100%
4,000 m6,551 km²100%
6,000 m6,551 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 Hangzhou Bay?

On average about 10 m in the GEBCO grid (the middle value is 8 m). The deepest cell inside its outline is 114 m, at 29.99° N, 121.94° E.

How big is the Hangzhou Bay?

About 6,551 km² of water inside its Natural Earth outline, counted from the grid cells that are below sea level.

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

With the sea 10 m lower, about 4,832 km² (73.7%) 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

Embed this map

Copy this code into your web page. It is free to use. Please keep the link under the map, as it is how people find where the map comes from.