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One of the singular features of Baotou, an industrial city of 2 million people in Inner Mongolia, is a 10-square-kilometer (4-square-mile) lake that is among the most polluted in the world. The artificial lake, referred to by the name of the dam associated wi…
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Glenn Zorpette15 Oct 20263 min readGlenn Zorpette is editorial director for content development at IEEE Spectrum.

The Baogang Tailings Dam, near the industrial city of Baotou, in Inner Mongolia, is one of the most polluted bodies of water in the world. The 11-square-kilometer artificial lake holds the effluent from decades of rare-earth and other industrial-processing operations.
Frederic J. Brown/AFP/Getty Images