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¡¾Ë«Óï²Î¿¼Îı¾¡¿This is Turpan oasis.And it's famous in China for an unexpected product.Grapes.But how on earth can a water-hungry crop grow in such abundance in a desert?The secret lies below ground.A subterranean network of canals known as karez is used to channel water around Turpan's streets and into the vineyards.But where does the water come from?The clue lies on the desert floor in these lines of holes which mark the course of the subterranean waterways. Over two millennia ago, local people carved more than 3,000 kilometres of these canals beneath the desert, diverting water from the distant mountains.Channelling the flow underground means that less water is lost to evaporation in the desert heat.

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