National park, southern Alaska, U.S. Located on the western shore of Cook Inlet, it was proclaimed a national monument in 1978 and a national park in 1980.
Its total area is 3,653,000 acres (1,478,300 hectares). Lake Clark, more than 40 mi (65 km) long, is the largest of its glacial lakes; it feeds rivers that provide the most important spawning ground for red salmon in North America. The park includes glaciers, waterfalls, and active volcanoes.