The United States National Park system encompasses approximately 83.6 million acres, of which more than 4.3 million acres remain in private ownership. The largest area is Wrangell - St Elias National Park and Preserve[?], Alaska. At 13,200,000 acres it is 16.3 percent of the entire system. The smallest unit in the system is Thaddeus Kosciuszko National Memorial[?], Pennsylvania, at 0.02 of an acre.
See also : List of United States National Parks
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