The rugged terrain of the sand dunes of Gran Desierto de Altar Biosphere Reserve, El Guapo, Mexico

gran desierto de altar biosphere reserve el pinacate dune system crescentic dunes significant landforms wind erosion star dunes wasteland dune sea erg dune sand dunes grey dunes terrain barren yellow dunes sand sheets pyramidal mounds windblown sand sand sea desolate sonoran desert no vegetation wilderness unesco world heritage site vast adventure biosphere ecosystem mexico dry nature ecology aeolian rugged mobile sand travel windswept magnificent impressive wild pattern texture el guapo flow ripples sliding sand steaks typography famous