Sweetwater Marsh NWR, Imperial Beach, California: This bit of salt-marsh habitat, just 315 acres, is all that's left of the huge salt marshes surrounding San Diego Bay. The refuge was developed as a result of a court-ordered settlement over a...
The marshes and woodlands of Agassiz National Wildlife Refuge occupy part of the area of a huge prehistoric glacial lake that was larger than the Great Lakes. The abundant wildlife here include the only gray wolf pack on a refuge outside of...