![](http://photos1.blogger.com/blogger/5486/1453/320/okavango_swamp_watershed.jpg)
Image from the World Resources Institute's Watersheds of the World, which can be found in HOORC's Library.
World Resources Institute. 2006. EarthTrends: The Environmental Information Portal. Available at http://earthtrends.wri.org. Washington DC: World Resources Institute.
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