United States - Adrian Gilani
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Footprints in the Dunes

A trail of footprints is seen in the soft sands of Great Sand Dunes National Park in Southern Colorado.

The park contains the tallest sand dunes in North America, rising about 750 feet (230 m) from the floor of the San Luis Valley on the western base of the Sangre de Cristo Range, covering about 19,000 acres. These dunes started forming about 440,000 years ago.

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