October 7, 2010
Lencois Maranhenses National Park, Brazil
Photograph by George Steinmetz, National Geographic
This Month in Photo of the Day: National Geographic Magazine Features
Waves of sand, firmed by an overnight rain, flow along the route of a fisherman pedaling his catch at dawn to trade it for supplies. When the dune dries in a day or so, the wind will begin to reshape it once again.
See more photos from the July 2010 story "A Sea of Dunes."
See photos of U.S. National Parks »