rights of way, sites, resources and viewsheds, though the trails do not have fixed boundaries. They work in cooperation with each other, states, local governments, land trusts, and private landowners to coordinate and protect lands and structures along these trails, enabling them to be accessible to the public. These partnerships between the agency administrators and local site managers are vital for resource protection and the visitor experience. The Federal Interagency Council on the National Trails System promotes collaboration and standardization in trail development and protection. National recreation trails and connecting and side trails do not require congressional action, but are recognized by actions of the secretary of the interior or the secretary of agriculture. The national trails are supported by volunteers at private non-profit organizations that work with the federal agencies under the Partnership for the National Trails System and other trail type-specific advocacy groups. For fiscal year 2021, the 24 trails administered by the NPS received a budget of $15.4 million. National Scenic Trails The eleven national scenic trails were established to provide outdoor recreation opportunities and to conserve portions of the natural landscape with significant scenic, natural, cultural, or historic importance. These trails are continuous non-motorized long-distance trails that can be backpacked from end-to-end or hiked for short segments, except for Natchez Trace NST, which consists of five shorter, disconnected trail segments. The Trails for America report said, "Each National Scenic Trail should stand out in its own right as a recreation resource of superlative quality and of physical challenge." Most notably, the national scenic trail system provides access to the crest of the Appalachian Mountains in the east via the Appalachian Trail, of the Rocky Mountains in the west on the Continental Divide Trail, and of the Cascade and Sierra Nevada ranges on the Pacific Crest Trail, which make up the Triple Crown of Hiking. Other places of note include the southern wetlands and Gulf Coast on the Florida Trail, the North Woods on the North Country Trail, the variety of southwestern mountains and ecosystems on the Arizona Trail, and the remote high-mountain landscape near the Canadian border on the Pacific Northwest Trail. They have a total length of approximately . Due to the extent of construction of route realignments, segment alternatives, and measurement methods, some sources vary in their distances reported and values may be rounded. Of the eleven national scenic trails, Appalachian, Natchez Trace, and