The Great Sand Dunes National Park is located in the San Luis Valley up against the Sangre de Cristo Mountains. These mountains form a natural barrier trapping the blowing sand into the tallest dunes in North American. They cover about 40 square miles and reach up to 750 feet in height. The dunes are open to be climbed and played upon. There is a...

The Great Sand Dunes National Park is located in the San Luis Valley up against the Sangre de Cristo Mountains. These mountains form a natural barrier trapping the blowing sand into the tallest dunes in North American. They cover about 40 square miles and reach up to 750 feet in height. The dunes are open to be climbed and played upon. There is a shallow, great wading, stream running along the base. There is camping available in the park and a very nice visitor's center.

The dunes were formed from sand and soil deposits of the Rio Grande and its tributaries, flowing through the San Luis Valley. Over the ages, westerly winds picked up sand particles from the river flood plain. As the wind lost power before crossing the Sangre de Cristo Range, the sand was deposited on the east edge of the valley. This process continues, and the dunes are slowly growing. The wind changes the shape of the dunes daily.

There are several streams flowing on the perimeter of the dunes. The streams erode the edge of the dune field, and sand is carried downstream. The water disappears into the ground, depositing sand on the surface. Winds pick up the deposits of sand, and blow them up onto the dune field once again.

Digging a couple inches into the dunes even at their peaks reveals wet sand. Part of the motivation of turning the Monument into a National Park was the extra protection of the water, which Colorado's cities and agriculture covet.

It is very easy to experience the dune-building process. This is a very windy region, as hikers on the Sand Dunes will attest, as on many days they will be pelted by sand and even small rocks when hiking on the dunes. The wind carries sand and rocks from many miles away. Wiki

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