Among conserved public lands and waters, wilderness is a category unto itself. It is land and water designated by Congress for special protection under the Wilderness Act of 1964. In the United States, there are 765 designated wilderness areas comprising about 109 million acres in 44 states and Puerto Rico. The U.S. Fish and Wildlife Service manages more than 20 million acres of designated wilderness in the Refuge System. To find out what makes wilderness special, check out this week’s story.