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Because it keeps varying and while it was once one of the African continent's largest bodies of fresh water it has dramatically decreased in size due to climate change and human demand for water. According to a study by University of Wisconsin- Madison researchers, working with NASA's Earth Observing System program, the lake is now 1/20th of the size it was 35 years ago. The approx surface area is 1,350 km².

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Q: Why is it difficult to say how large Lake Chad is?
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