Overview: The National Wildlife Refuge System, part of the U.S. Fish and Wildlife Services, is dedicated to protecting 150 million acres of land and water from the Caribbean to the Pacific, plus more than 418 million acres of national marine monuments.

How to Use This Resource: This site explains the Sea Level Affecting Marshes Model, which is the foundation of sea-level rise planning for the refuge system on the national level. The model provides maps and tables projecting sea-level rise scenarios between 2025 and 2100.