National Wildlife Refuge System

"The National Wildlife Refuge System has more than 20 million acres of designated wilderness. It has 75 wilderness areas – about one-fifth of the designated wilderness acres in the United States -- on 63 refuges in 26 states. About 90 percent of the Refuge System’s wilderness is in Alaska...."

Wildlife refuge

Recreation.gov

Use this site to look for federal recreation areas:  camping & lodging; day use & picnic areas; permits & wilderness; and  tours & tickets.