Kobuk Valley: Sand Dunes Above the Arctic Circle and Nine Thousand Years of Hunters

Twenty-five square miles of active sand dunes sit in the middle of the western Brooks Range, some of them rising a hundred feet, and there is no road to them. You get to Kobuk Valley National Park by small plane, landing on a gravel bar along the Kobuk River, and then you walk or paddle. The park receives roughly fifteen thousand visitors a year. It is one of the least-visited units in the National Park System, which means the dunes are almost always empty.

The dunes should not be there. The Kobuk River runs cold nearby. Spruce forests surround them on three sides. They exist because glaciers ground the local sandstone into fine particles over thousands of years, the river deposited them in the valley, and the prevailing winds have been sorting and rearranging them ever since. They are Arctic sand dunes, which is a sentence that requires a moment to settle.

A few miles downstream from the dunes, the south bank of the Kobuk River holds one of the most archaeologically significant sites in the Arctic. The place is called Onion Portage, and it has been occupied, continuously or nearly so, for roughly nine thousand years. Excavations beginning in the nineteen fifties, led by archaeologist J. Louis Giddings, revealed a stratigraphic record of every major Arctic culture in Alaska stacked on top of each other in the river bank: Paleo-Arctic tools at the bottom, then Arctic Small Tool, then Norton, then the direct ancestors of the Iñupiat people who live in the Kobuk Valley today. Giddings described it as a window into the entire prehistory of the North American Arctic.

The reason is simple. Every autumn, the Western Arctic caribou herd, one of the largest in the world, crosses the Kobuk River at this exact bend. The animals bunch at the crossing and enter the water. For nine thousand years, hunters who knew the river knew where to wait.

The Alaska National Interest Lands Conservation Act created the park in nineteen eighty and guaranteed Iñupiat subsistence rights within it, including the right to hunt caribou at this crossing. The hunt that sustained people here for nine thousand years is still permitted. The dunes are still moving.