1. 
   Ugab River
   The Ugab River is an ephemeral river that only flows above the surface of its sandy bed a few days each year, but even during much of the dry season its subterranean water surfaces as pools in places, and provides an important resource for species in the Damaraland region of northern Namibia. The U...
   Found op http://en.wikipedia.org/wiki/Ugab_River
   
   

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