designated as a national wilderness National Wilderness Preservation System Federal Wilderness Area National Wilderness Preservation System United States Wilderness Areas 美国国家荒野保护区 United States Wilderness Areas National Wilderness Preservation System wilderness "National Wilderness Preservation System." Wilderness Protection English Federal Wilderness Area Federal Wilderness Area Wilderness Areas English National Wilderness Area National Wilderness Preservation System Federal Wilderness Area National Wilderness Preservation System wilderness area Federal Wilderness Area English Federal Wilderness Area National WildernessPreservation System Federal Wilderness Area National Wilderness Area http://en.wikipedia.org/wiki/National_W ... ion_System Federal Wilderness Area Wilderness Federal Wilderness Area National Wilderness Preservation System English English National Wilderness Preservation System National Wilderness Preservation System. National Wilderness Preservation System wilderness areas en National Wilderness Preservation System 4.5% of the US land mass Federal Wilderness Area National Wilderness Preservation System Federal Wilderness Area