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Separating sediment China's Three Gorges project has taken all the headlines. But on the Yellow River a second large and complex dam is also rising. Report and photographs by Adrian Greeman.

Vast grey semi-cylindrical buttresses tower against a sheer cliff face, with tiny figures moving here and there. Behind the vertical pylons, giant caverns penetrate the sheer rock like the entrance to a Pharaonic tomb in the Valley of the Kings. A wide river runs sluggishly below and plains stretch beyond.

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