Fodor's Expert Review Kobuk Valley Sand Dunes

South of the Kobuk River, the Great Kobuk (the largest active, high-altitude dune field on Earth), Little Kobuk, and Hunt River Sand Dunes—stabilized by small trees, shrubs, and the lichen that's typical of the tundra—cover much of the southern Kobuk Valley. They formed when glaciers slowly pulverized mountain rock into sand that washed into the valley during the last ice age. Of note, a flowering herb called the Kobuk locoweed is only found on the slopes of the Great Kobuk Sand Dunes. Most outfitters and air taxis that operate in the Arctic will take visitors to the sand dunes.