IntegrityAt nearly 900,000 hectares, Yellowstone National Park is a large property, and is at the heart of the vast “Greater Yellowstone Ecosystem,” (GYE) encompassing over 7 million hectares. Only about 2% of Yellowstone National Park is developed (visitor and park infrastructure, roads, etc. Protection and management requirementsDesignated by the U.S. Congress in 1872 as the world’s first national park, Yellowstone is managed under the authority of the Organic Act of August 25, 1916 which established the United States National Park Service. In addition, the National Park Service has established Management Policies which provide broader direction for all National Park Service units, including Yellowstone. In Yellowstone National Park, these vital signs include land use, climate, amphibians, water resources, whitebark pine, and others.