Federal lands financing -- The National Forest System -- Bureau of Land Management -- The National Wildlife Refuge System -- The National Park System -- Special systems on federal lands -- The National Wilderness Preservation System -- The National Wild and Scenic Rivers System -- National Trails System. The federal government owns about 671.8 million acres (29.6%) of the 2.27 billion acres of land in the United States. Four agencies administer 628.4 million acres (93.5%) of this land: the Forest Service in the Department of Agriculture, and the Bureau of Land Management, Fish and Wildlife Service, and National Park Service, all in the Department of the Interior. Most of these lands are in the West, including Alaska. They generate revenues for the U.S. Treasury, some of which are shared with states and localities. The agencies receive funding from annual Interior and Related Agencies appropriation laws, trust funds, and special accounts.