About Ocean Floor Map
An interactive ocean floor map of the world. Tap anywhere for the depth of the sea, find the Mariana Trench and other undersea features, and drag a slider to drain the oceans and see the land that was dry in the Ice Age.
Ocean Floor Map is a free, single-purpose website. It is built to be useful on its own: you can explore the map, share a link to exactly what you are looking at, embed it on your own page or download an image of it. Everything is made from open data, and the credits are on the data sources page.
Who runs it
This site is run by Chris Barnes, a sole trader (England and Wales). It is one of a small family of map sites; you can find the others in the "More maps" list at the bottom of every page.
How accurate is it?
We show the data as its authors published it, and we try to be honest about how certain it is. Where something is a best guess, the map says so. If you spot a mistake in how we display or describe the data, please tell us.
How it is paid for
The site is free to use. It may show adverts, and it offers an optional email newsletter. We do not sell your personal data.
Why this site exists
Most ocean floor maps are a single picture, and most of the pictures you find are not interactive. This one lets you tap anywhere to see how deep the sea is, find named trenches, ridges and undersea mountains, and drain the oceans to see what the world looked like when the sea was lower.
How the map is made
The depths come from the GEBCO_2026 Grid, a worldwide map of the ocean floor and the land. Scripts turn it into map tiles, work out the land at each sea level, and measure the depth of 950 named features and 268 oceans, seas and gulfs. We do not draw anything by hand, and every number on the site is calculated from the grid by the same scripts each time. Across 12 sea level steps, the "drain the oceans" slider shows the land that would be dry. The data sources page has the full credits.
Please do not use it for navigation
The GEBCO Grid should NOT be used for navigation or for any other purpose involving safety at sea. Most of the seabed is not surveyed in detail, and the map tiles are coarser than the grid.