National Wetland Inventory

The National Wetland Inventory (NWI) is a U.S. government program that maps and documents wetlands across the country. Using satellite data, aerial photography, and field studies, it identifies areas like swamps, marshes, and bogs. The goal is to provide accurate, accessible information about wetlands for conservation, land use planning, and environmental protection. This detailed mapping helps scientists, agencies, and communities understand wetland locations, health, and extent, supporting efforts to preserve these vital ecosystems that support biodiversity, filter water, and mitigate floods.