National Wetlands Inventory: Wetlands Mapper

The NWI aims to inventory U.S. wetlands, and the Wetlands Mapper is a web-based tool providing access to over 34 million features of wetlands and surface water habitats across the United States. Users can navigate the map, find locations, and download wetland maps (PDF) and geospatial data (Geodatabase, Geopackage, or Shapefile), which are updated biannually.