The Tsauchab is an ephemeral river in the Hardap Region of central Namibia. Its source is in the southern Naukluft Mountains, from where it flows westwards through the Namib-Naukluft National Park into Sossusvlei, an endorheic basin. The lower river has in the past had a slightly different courses and also formed two other basins, the Deadvlei and the Hiddenvlei.