China is working on an incredibly ambitious water diversion project involving the Brahmaputra, one of India’s largest rivers, which may become another point of tension between the two Asian neighbours. Chinese engineers are testing techniques that could be used to build a 1,000-kilometre (km) tunnel—the world’s longest—to carry water from Tibet to Xinjiang, a barren region in northwest China, according to a report in the South China Morning Post.

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