Dunas de Yeso Gypsum Dune Field

Dunas de Yeso is an 800-hectare field of pure white gypsum crystal dunes inside the Cuatrocienegas Natural Protected Area in Coahuila, Mexico, one of only a handful of gypsum dune systems on Earth. The subject is texture and form rather than color, so compositions typically place a single dune ridgeline low in the frame with a wide, empty sky above, or isolate the wind-carved ripples with a longer lens to keep the scene abstract and minimal. Sunrise and sunset produce the strongest results, since raking side light rakes across the ridgelines and casts long shadows that reveal the sand's texture; overhead midday sun erases those shadows and leaves the dunes looking flat and gray-white. The field is photographable year-round, but winter mornings bring the softest, least hazy light and the coolest temperatures for walking on the open sand. The dunes see far fewer visitors than the reserve's pools, so solitude is rarely an issue, though wind can quickly blow footprints into a planned composition, favoring an early start before other visitors' tracks appear. Walking is permitted on marked trails only, off-trail travel is restricted to protect the fragile gypsum crust, drones require prior authorization from the reserve, and the standard protected-area entrance fee applies.