A setting sun tints the clouds orange and pink, as they pass over the sand dunes at Gran Desierto de Altar Biosphere Reserve, also known as El Guapo, Mexico

timelapse sunset clouds cloudscape pink orange sand sand dunes barren empty lonely isolated dry desert gran desierto de altar biosphere reserve el guapo mexico vast unesco world heritage site significant landforms erg dune windswept no vegetation sand sea dune sea windblown sand mobile sand wind erosion magnificent star dunes pyramidal mounds sand sheets crescentic dunes dune system yellow dunes biosphere waves ripples wilderness adventure texture nature travel wild sliding wasteland desolate ecology ecosystem