Bathymetry is the measurement of the depth of water in oceans, rivers, or lakes. Bathymetric maps look a lot like topographic maps, which use lines to show the shape and elevation of land features. We'ves collected many maps which you may view, download and use free of charge. We've even created a bunch of our own! If you have a map that we're missing and want to add it to our map library, contact us!