Parmenter (left) and Liana Welty hike across a large dune, Great Sand Dunes National Park, Colorado.

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Photo credit: © CI2 / Alamy / Afripics
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Keywords: abstract, adult, america, caucasian, color, colorado, day, dune, dunes, great, hiker, horizontal, image, man, national, north, outdoors, park, people, recreation, sand, small, states, united, usa, woman