What makes the Lakes of Ounianga in northern Chad highly unusual for water bodies in the middle of the Sahara?
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The Lakes of Ounianga consist of eighteen interconnected lakes supplied by an ancient underground aquifer. Despite extreme desert heat and evaporation, some of these lakes remain fresh enough to support diverse aquatic life, thanks to a thick layer of floating reeds. Photo: Jacques Taberlet, Wikimedia Commons, CC BY-SA 3.0.
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Source: Wikipedia (CC BY-SA)
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