Dunas de Yeso Gypsum Dunes Walk

The Dunas de Yeso Gypsum Dunes Walk crosses roughly 800 hectares of pure white gypsum crystal dunes, among the rarest dune formations in the world, within the Cuatro Cienegas Natural Protected Area in Coahuila. The trailhead is reached by private vehicle from Cuatro Cienegas town via Federal Highway 30 toward San Pedro de las Colonias, about 16 kilometers to the site; there is no public transit option and no formal trail infrastructure beyond a parking pull-off. There is no marked path across the dunes, since the crusted gypsum sand supports foot traffic almost anywhere on the field, giving routes of roughly 2 to 4 kilometers depending on how far visitors choose to walk. The terrain is flat, with only low rolling dunes under 15 meters, and no technical difficulty, though the surface can be soft in patches. There is no shade anywhere on the dune field, and the white gypsum reflects intense sunlight. Because there is no fixed route, the main landmarks are the dune formations themselves, along with occasional patches of gypsum-adapted vegetation found nowhere else. Turnaround points are a matter of choice; many visitors walk to a central high point for panoramic views over the dune field before retracing their steps to the parking area. There are no water sources, shelters, or refuge points anywhere on the dunes, so the recommended 2 litres of water is important given the sun exposure and reflected glare. Sunglasses are essential, as the gypsum's glare can be more intense than the desert sand elsewhere in the reserve. The walk is possible year-round, but sunrise and sunset avoid the harshest midday sun and also produce the most striking light on the white dune surfaces.