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The National Trails System was created by the National Trails System Act (), codified at ''et seq.'' The Act created a series of National trails "to promote the preservation of, public access to, travel within, and enjoyment and appreciation of the open-air, outdoor areas and historic resources of the Nation." Specifically, the Act authorized three types of trails: the National Scenic Trails, National Recreation Trails and connecting-and-side trails. The 1968 Act also created two national scenic trails: the Appalachian and the Pacific Crest; and requested that an additional fourteen trail routes be studied for possible inclusion. In 1978, as a result of the study of trails that were most significant for their historic associations, a fourth category of trail was added: the National Historic Trails. Since 1968, over forty trail routes have been studied for inclusion in the system. Of these studied trails, twenty-one have been established as part of the system. Today, the National Trails System consists of 30 National Scenic and Historic Trails and over 1,000 National Recreation Trail and two connecting-and-side trails, with a total length of more than . These National Trails are more than just for hiking, many are also open for horseback riding, mountain biking and camping. As Congressionally established long-distance trails, each one is administered by a federal agency, either the Bureau of Land Management, United States Forest Service, or National Park Service. Two of the trails are jointly administered by the BLM and the NPS. Occasionally, these agencies acquire lands to protect key sites, resources and viewsheds. More often than not, they work in partnership with the states, local units of government, land trusts and private landowners, to protect lands and structures along these trails, enabling them to be accessible to the public. 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. All of the National Trails are supported by private non-profit organizations that work with the various federal agencies under the Partnership for the National Trails System (PNTS). The Act is codified as . However, it has been amended numerous times since its passage,〔(Notes on 16 U.S.C. § 1241-1251 )〕 most recently on October 18, 2004 ().〔(The Act ), from the National Park Service〕 ==National Scenic Trails== (詳細はAppalachian Mountains in the east, on the Appalachian Trail, to the Rocky Mountains of the west on the Continental Divide Trail. You can experience the subtle beauties of the southern wetlands and Gulf Coast on the Florida Trail or wander the North Woods from New York to Minnesota on the North Country Trail or experience the vast diversity of landscapes of the southwest on the Arizona National Scenic Trail. There are eleven trails designated in the United States.〔National Trails System brochure, National Park Service & Bureau of Land Management, Dept. of Interior; and the Forest Service, Dept. of Agriculture〕 * Appalachian National Scenic Trail * Arizona National Scenic Trail * Continental Divide National Scenic Trail * Florida National Scenic Trail * Ice Age National Scenic Trail * Natchez Trace National Scenic Trail * New England National Scenic Trail * North Country National Scenic Trail * Pacific Crest National Scenic Trail * Pacific Northwest National Scenic Trail * Potomac Heritage National Scenic Trail 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「National Trails System」の詳細全文を読む スポンサード リンク
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