For the purpose of conserving and interpreting unique scenic and other natural values and objects of historic interest, including preservation of portions of the Current River and the Jacks Fork River in Missouri as free-flowing streams, preservation of springs and caves, management of wildlife, and provisions for use and enjoyment of the outdoor recreation resources thereof by the people of the United States, the Secretary of the Interior (hereinafter referred to as the "Secretary") shall designate for establishment as the Ozark National Scenic Riverways the area (hereinafter referred to as "such area") generally depicted on map numbered NR OZA 7002 entitled "Proposed Ozark National Rivers" dated December 1963 which map is on file for public inspection in the office of the National Park Service, Department of the Interior: Provided, That the area so designated shall not include more than sixty-five thousand acres of land now in private ownership and that no lands shall be designated within two miles of the present boundaries of the municipalities of Eminence and Van Buren, Missouri. The Secretary, with the concurrence of the State, shall designate for inclusion in the Ozark National Scenic Riverways, the lands composing Big Springs, Alley Springs, and Round Spring State Parks, and the Secretary is hereby directed to negotiate with the State for the donation and the inclusion of such park lands in the Ozark National Scenic Riverways.