The Kuiseb River in Namibia is bordered on one side by the tallest sand dunes in the world, and on the other by barren rock. The red sand dunes south of the river reach heights over 150 meters. The prevailing winds blow the dunes northward, but their movement is blocked by the river. In the process, so much sand and silt is deposited in the Kuiseb that it only reaches the sea while it is in flood.
Reference
The original entry was from the NASA Earth Observatory [1] (http://earthobservatory.nasa.gov/Newsroom/NewImages/images.php3?img_id=4087)
The Kuiseb project is known as Environmental Learning and Action in the Kuiseb (ELAK) and was established in 2001 with funding from the European Union.
The users of the Kuiseb's resources are from Walvis Bay, the Topnaar community, the Namib Naukluft Park and the commercial farmers along the upper river in the Khomas Hochland.
She said although the Kuiseb was one of the mostly studied rivers in the country, there was not much information on the upper catchment area.