In early morning and late afternoon, the dunes at Sesriem in the Namib-Naukluft Park, are breathtakingly beautiful. Patterned by, and shifting with, the wind, these dunes vary from brick red to apricot and forever change colour with the angle of the sun. The largest rise dramatically 1,000 feet above the surrounding plains and are said to be the largest dunes in the world; they are certainly the most picturesque.Being almost rainless, the area has a poorly developed drainage system. Most seasonal streams terminate in saltpans or mud flats (vleis) against or among the dunes, such is the case in this photograph.