• The U.S. Fish and Wildlife Service manages more than 20 million acres of wilderness in the National Refuge System. There are 75 wilderness areas on 63 refuges in 25 states.

  • About 90 percent of Refuge System wilderness is in Alaska.

  • The largest Refuge System wilderness area is the 8–million–acre Mollie Beattie Wilderness at Arctic National Wildlife Refuge in Alaska.

  • The smallest Refuge System wilderness area is the six–acre wilderness at Pelican Island Refuge in Florida.

  • The most recent additions to Refuge System wilderness areas came in 1994—3,195 acres at Havasu Refuge and 5,836 acres at Imperial Refuge. Both refuges straddle the Colorado River, which forms the California–Arizona border.

  • There are 21 proposed wilderness areas (all managed as wilderness) and another dozen wilderness study areas under consideration in the Refuge System.

  • Much of Leadville National Fish Hatchery lies within a 30,500–acre wilderness in Colorado. The Mount Massive Wilderness is co–managed by the U.S. Fish and Wildlife Service and the U.S. Forest Service.