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The total area protected by national parks is approximately 52.4 million acres (212,000 km 2), for an average of 833 thousand acres (3,370 km 2) but a median of only 220 thousand acres (890 km 2). [8] The national parks set a visitation record in 2021, with more than 92 million visitors. [9]
There are 63 officially designated national parks in the United States and its dependent areas, as of 2021. [2] The national parks are considered the "crown jewels" of the system and are typically larger than other areas, including a variety of significant ecological and geological resources.
Some state parks, like Adirondack Park, are similar to the national parks of England and Wales, with numerous towns inside the borders of the park. About half the area of the park, some 3,000,000 acres (1,200,000 ha), is state-owned and preserved as "forever wild" by the Forest Preserve of New York .
The U.S. Fish and Wildlife Service's National Wetlands Inventory (NWI) produces and provides information on the characteristics, extent, and status of U.S. wetlands and deepwater habitats and other wildlife habitats. The NWI also produces periodic reports on the status and trends of wetlands in the conterminous U.S.
The National Wildlife Refuge System (NWRS) is a system of protected areas of the United States managed by the United States Fish and Wildlife Service (FWS), an agency within the Department of the Interior. The National Wildlife Refuge System is the system of public lands and waters set aside to conserve America's fish, wildlife, and plants.
These units are a subset of the areas in the United States National Park System, and nearly all participate in the national park passport stamps program. National Park System units are found in all 50 states, in the District of Columbia , and in the U.S. territories of Guam , American Samoa , the U.S. Virgin Islands , and Puerto Rico .
This list of Ramsar sites in the United States are those wetlands that are considered to be of international importance, protected under the Ramsar Convention treaty. The United States as of 2020, has 41 sites designated as "Wetlands of International Importance" with a surface area of 1,884,551 hectares (7,276.29 sq mi; 18,845.51 km 2).
Yellowstone National Park in the United States was the first national park in the world. [1] [2] This is a list of the number of national parks per nation, as defined by the International Union for Conservation of Nature. Nearly 100 countries around the world have lands classified as a national park by this definition.