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National Park System: Establishing New Units The National Park System includes 392 diverse units administered by the National Park Service (NPS) of the Department of the Interior. Units generally are added to the National Park System by act of Congress, although the President may proclaim national monuments on land that is federally managed for inclusion in the System. Before enacting a law to add a unit, Congress might first enact a law requiring the NPS to study an area, typically to assess its national significance, suitability and feasibility, and other management options. Important areas also are preserved outside the National Park System through programs managed or supported by the NPS.