China spent decades moving water across a continent. The world's largest diversion project now serves 185 million people

In 2002, China's State Council formally approved construction of the South-to-North Water Diversion Project, an engineering undertaking designed to move water from the relatively water-rich Yangtze River basin in the south to the chronically dry cities and farmland of northern China, including Beijing. More than two decades later, the project stands as the largest water transfer scheme ever built anywhere in the world, moving tens of billions of cubic metres of water annually through thousands of kilometres of canals, tunnels and aqueducts.

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