Indian ricegrass and blowout grass grow naturally on the dunes and is nature's way of stabilizing the sands from wind erosion.The Great Sand Dunes with the Sangre de Cristo Mountains behind, Great Sand Dunes National Park and Preserve, near Mosca, Colorado USA. The park contains the tallest sand dunes in North America, rising about 750 feet above the floor of the San Luis Valley.The Great Sand Dunes with the Sangre de Cristo Mountains behind, Great Sand Dunes National Park and Preserve, near Mosca, Colorado USA. The park contains the tallest sand dunes in North America, rising about 750 feet above the floor of the San Luis Valley.
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