The protected areas of the United States are managed by an array of different federal, state, tribal and local level authorities and receive widely varying levels of protection. Some areas are managed as wilderness while others are operated with acceptable commercial exploitation. By international definitions, the United States had 7448 protected areas, not counting marine areas, as of 2002. These protected areas cover 578,000 square miles (1,500,000 km²), almost 16% of the land area of the United States. This is also one-tenth of the protected land area of the world. U.S. marine protected areas cover an additional 347,000 square miles (900,000 km²) with varying levels of protection.
Some areas are managed in concert between levels of government. The Father Marquette National Memorial is an example of a federal park operated by a state park system while Kal-Haven Trail is an example of a state park operated by county-level government.
The highest levels of protection as described by the IUCN, the international conservation agency, are Level I (Wilderness areas) and Level II (National Parks). The United States maintains 12% of Level I and II lands in the world. These lands had a total area of 210,000 square miles (540,000 km²).
A confusing system for naming protected areas results in some types being used by more than one agency. For instance, both the National Park Service and the U.S. Forest Service operate areas designated National Preserves and National Recreation Areas. Both the NPS and the Bureau of Land Management operate areas called National Monuments. Wilderness Areas are designated within other protected areas managed by various agencies and sometimes wilderness areas span areas managed by multiple agencies.
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