Sign at the entrance to the dune field which reads "Entering Great Sand Dunes Wilderness - 'where man himself is a visitor who does not remain' 1964 Wilderness Act." Great Sand Dunes National Park and Preserve contains the tallest sand dunes in North America. The Dunefield, topping off with Star Dune at 750 feet, is created by sand trapped by the nearby Sangre de Christo Mountains (larger rougher grains and pebbles) and the San Juan Mountains (65 miles to the west). Waterways such...
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Sign at the entrance to the dune field which reads "Entering Great Sand Dunes Wilderness - 'where man himself is a visitor who does not remain' 1964 Wilderness Act." Great Sand Dunes National Park and Preserve contains the tallest sand dunes in North America. The Dunefield, topping off with Star Dune at 750 feet, is created by sand trapped by the nearby Sangre de Christo Mountains (larger rougher grains and pebbles) and the San Juan Mountains (65 miles to the west). Waterways such as Medano Creek help carry the sediment down to the San Luis valley where the dunes are found. Great Sand Dunes National Park and Preserve, Mosca, Colorado.
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