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Understanding What a Unit of the National Park System Is


The national park system consists of more than 385 units. The units go by many names - national parks, monuments, historic sites, historical parks, seashores, recreation areas, and many others. In total there are more than 20 different park "titles" within the park system.

These numerous designations sometimes confuse visitors and, in fact, the titles have not been used consistently over the years. The names are created by the laws and executive orders establishing the sites. Many names are descriptive -- lakeshores, seashores, battlefields -- but others cannot be neatly categorized because of the diversity of resources within them. In 1970, Congress passed legislation saying all units of the system have equal legal standing in a national system.

Units of the national park system are defined as "areas of land or water administered by the Secretary of the Interior through the National Park Service." In practice, "administration" occurs in many ways, from "traditional" units, which are federally owned and managed, to "nontraditional" units, which rely on partnerships and may have little, if any, federal land ownership (Boston Harbor Islands National Recreation Area, for example). Congress has also recognized certain areas as being "affiliated" with the national park system, but they are not NPS "units" and NPS does not own or manage these sites (e.g. Theodore Roosevelt Inaugural National Historic Site, Thomas Cole National Historic Site, Lower East Side Tenement Museum National Historic Site.

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