The St. Anthony Sand Dunes consists of 11,000 acres of clear, shifting, white quartz sand. Although this is a wilderness study area, the dunes support high off-road vehicle traffic. Dunes up to 400 feet high attract riders from throughout the west. ORV users are strongly encouraged to avoid damage to vegetation and impacts to wildlife so that use of this unique area may continue. Others prefer to explore the dunes on horse and on foot. In the winter, it is a popular sledding and tubing area. Approximately 2,000 elk, 50 moose, and 1,400 mule deer winter in the vicinity.