Most of the sand that travels from the west to the east gets captured by Medano Creek that runs near the east and south edge of the dunes. During spring and early summer, water coming from the nearby mountains carries the sand around the southwest side of the dunes. When the creek dries up in late summer, the prevailing southwesterly winds carry the sand to the dunes for another trip across the dune field.
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- Great Sand Dunes National Park