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Slide 23: The Rutshuru river within Virunga National Park (DR Congo) Zaire along a deeply incised meader. This indicates that in times past much more water flowed through this course. The reduced amount flow of recent times resulted from a capture of water in the headwaters that reduced the flow. The capture occurred when the uplifted Virunga volcanoes blocked the rift valley, creating Lake Kivu,a lava-blocked lake as well as a river reversal--todays Ruzizi river. See Tour II Slide 7,  the Locator Map as well as Tour II Slide 11 which shows the outflow of the Ruzizi river. 
Image credit: photo by Robert E. Ford, Westminster College of Salt Lake City, Utah 

Created 12 February 1998. Last updated 30 April 1998  by JDH.