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National Park System: Establishing New Units The National Park System (System) includes 401 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 acts of Congress, although the President may proclaim national monuments for inclusion in the System on land that is federally managed. An act of Congress creating a Park System unit may explain the unit’s purpose; set its boundaries; provide specific directions for land acquisition, planning, uses, and operations; and authorize appropriations for acquisition and development. Today, there are more than 20 different designations (i.e., titles) for units of the National Park System, reflecting the diversity of the areas.