16 U.S.C. § 79b — Park area

(a) Boundaries; maps; maximum acreage. Redwood National Park consists of the land shown on the official map called "Redwood National Park, Revised Boundary," numbered 167/60502, dated February 2003. That map must be kept on file for public viewing at National Park Service offices, and the Secretary of the Interior must give a copy to the relevant Del Norte and Humboldt County officials. The Secretary may adjust the boundaries over time — aiming to reduce stream siltation, protect timber, and preserve the park's scenery — by publishing a revised map or description in the Federal Register and filing it with the same officials who hold the original maps. However, the park can never total more than 133,000 acres, not counting submerged land and public highways and roads. (b) Highways and roads. The Secretary may buy some or all existing public highways and roads inside the park's boundaries, as needed for park purposes. Until they are bought, the Secretary may work with state and local officials to patrol and maintain them. (c) Park protection zone. In the area outside the park marked as the "Park Protection Zone" on a map called "Proposed Additions, Redwood National Park, California" (numbered 167–80005–D, dated March 1978), the Secretary may buy land and land interests — either from a willing seller, or after finding that not buying the land could physically damage park resources, and after notifying the relevant Senate and House committees. Any land bought this way must be managed to maximize protection of the park's resources, following the Federal Land Policy and Management Act (Act of October 21, 1976). Buying land under this subsection cannot reduce a neighboring landowner's right to peacefully use and enjoy their own land, and does not give the Secretary any power to buy more land beyond what this subsection allows.