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©Matthias Toedt/DPA/MAXPPP ; Tourists begin the rise of a dune in Sossusvlei shortly before sunrise, taken on 01.03.2019. The Sossusvlei in the Namib-Naukluft National Park has been a UNESCO World Heritage Site since 2013, and its famous, almost 400-meter high dune is one of the highest in the world. In the low-precipitation dune area, which is one of the special tourist attractions of Namibia, it becomes extremely hot during the summer months. The orange-red color of the sand is caused by a high proportion of iron oxide. Photo: Matthias Toedt / dpa-Zentralbild / ZB / Picture Alliance | usage worldwide