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The United States National Park system encompasses approximately 83.6 million acres (338 km²), of which more than 4.3 million acres (17,000 km²) remain in private ownership. The largest area is Wrangell - St Elias National Park and Preserve, Alaska. At 13,200,000 acres (53,000 km²) 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 (80 m²)
See also : List of United States National Parks