Act permanently unified the individual units as a public lands System, protecting the System in law so that it would no longer exist at the pleasure of each president. This marked the first new congressionally authorized public lands system in decades. The act also added of new designations to the System, including a National Monument, three National Conservation Areas, Wilderness, Wild and Scenic Rivers and National Scenic Trails. List of National Conservation Lands areas National monuments 28 sites totaling National conservation areas (NCAs) 17 sites totaling BLM wilderness areas 221 sites totaling ; excludes wilderness associated with other agencies Wilderness study areas There are 545 wilderness study areas with a total area of . National historic trails 11 sites totaling Distances and states are noted for BLM lands only. National scenic trails 5 units totaling Distances and states are noted for BLM lands only. National wild and scenic rivers 38 sites, totaling Other See also Protected areas of the United States List of national conservation lands in Colorado List of national monuments of the United States References External links BLM.gov: Official National Landscape Conservation System website BLM.gov: Complete list of wilderness study areas Conservation Lands Foundation Americanhiking.org: American Hiking Society Western Public Lands Initiative 01 Bureau of Land Management 01 Conservation Lands Protected areas of the United States Landscape Land management in the United States