The purpose of this page is to provide a centralized source of bathymetry maps and data for ocean planning in the northeastern United States. Datasets and data products are compiled from various sources. Some data products are produced by members of the Northeast Ocean Data Working Group.

What is Bathymetry?

Bathymetry is the measurement of water depth and the shape of seafloor terrain. Just as topographic maps represent the three-dimensional features (or relief) of dry land, bathymetric maps illustrate the land that lies underwater. On maps, variations in seafloor relief may be indicated by color and by contour lines called depth contours or isobaths.