Kobuk Valley National Park protects a remote Arctic wilderness famous for its massive sand dunes, caribou migrations, and pristine tundra landscapes. Located north of the Arctic Circle in northwestern Alaska, the park is one of the least visited national parks in the United States. The park contains the Great Kobuk Sand Dunes, towering dunes rising from the Arctic landscape, along with vast rivers, boreal forests, and wildlife-rich tundra ecosystems.