Discovery Trail. . (c) Comprehensive national discovery trail plan Section 7 of such Act ( 16 U.S.C. 1246 ) is further amended by adding at the end the following new subsection: (l) (1) For purposes of subsection (5)(b), a trail shall not be considered feasible and desirable for designation as a national discovery trail unless it meets all of the following criteria: (A) The trail must link one or more areas within the boundaries of a metropolitan area (as those boundaries are determined under section 134(c) of title 23, United States Code). It should also join with other trails, connecting the National Trails System to significant recreation and resources areas. (B) The trail must be supported by at least one competent trailwide volunteer-based organization. Each trail should have extensive local and trailwide support by the public, by user groups, and by affected State and local governments. (C) The trail must be extended and pass through more than one State. At a minimum, it should be a continuous, walkable route. (2) The appropriate Secretary for each national discovery trail shall administer the trail in cooperation with at least one competent trailwide volunteer-based organization. Where the designation of discovery trail is aligned with other units of the National Trails System, or State or local trails, the designation of a discovery trail shall not affect the protections or authorities provided for the other trail or trails, nor shall the designation of a discovery trail diminish the values and significance for which those trails were established. Not later than three complete fiscal years after the date of the enactment of any law designating a national discovery trail, the appropriate Secretary shall submit a comprehensive plan for the protection, management, development, and use of the trail, to the Committee on Natural Resources of the United States House of Representatives and the Committee on Energy and Natural Resources of the United States Senate. The responsible Secretary shall ensure that the