http://www.fs.usda.gov/btnf/

Located in Western Wyoming, the Bridger-Teton offers more than 3.4 million acres of public land for your outdoor recreation enjoyment. With its pristine watersheds, abundant wildlife and immense wildlands, the Bridger-Teton National Forest comprises a large part of the Greater Yellowstone Ecosystem - the largest intact ecosystem in the lower 48 United States. Offering nearly 1.2 million acres of designated Wilderness.