Kobuk Valley National Park is in northwestern Alaska 25 miles north of the Arctic Circle. It was designated a United States National Park in 1980 by the Alaska National Interest Lands Conservation Act. It is noted for the Great Kobuk Sand Dunes and caribou migration routes. The park offers backcountry camping, hiking, backpacking, and dog sledding. There are no designated trails or roads in the park, which at 1,750,716 acres, is approximately the size of the state of Delaware. The park is entirely above the Arctic Circle..Wikipedia .