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Great Sand Dunes National Park, Colorado 

The tallest sand dunes in North America are all found here, located south of Crestone and northeast of Alamosa, Co. The tallest sand dune rises to a height of 750 feet (229 m). The dunes cover an area of about 30 sq mi (78 km2). Medano Creek, on the east side of the dunes, is never stable, as fresh sand falls in the creek, creating surges of water which resemble waves. The surges occur at an average interval of about 20 seconds. In a high-water year, the surges can be as high as 20 in (51 cm). The "surge flow" is strongest during the peak flow period from May to early June in most years.

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View from Great Sand Dunes Visitor Center showing:
1) Cleveland Peak, 13,414' 2) First ridge of Dunefield 3) Medano Creek bed ; 4) Cottonwood Trees, Ponderosa Pines, and Pinyon Pines
(from Great Sands Dune National Park, CO)


Alamosa
(to the Southwest)
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