Kobuk Valley National Park (kōbŏkˈ) [key], 1,750,737 acres (709,048 hectares), NW Alaska. Located in rugged terrain N of the Arctic Circle, the park embraces the central valley of the Kobuk River, a centuries-old transportation route with many archaeological sites. The 70-mi (113-km) Salmon Wild River lies entirely within the park. Other features include caribou migration routes and the Great Kobuk Sand Dunes. Proclaimed a national monument in 1978, it was designated a national park in 1980. See National Parks and Monuments (table).