The Tsondab River is an ephemeral river in the Hardap Region of central Namibia. Its source is in the Remhoogte Mountains. From there it flows westwards through the Namib-Naukluft National Park before evaporating at Tsondabvlei. Inflows of the Tsondab are Diep, Noab and Koireb. Tsondab's catchment area is 3,500 km2 (1,400 sq mi).