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Yak traditional pack animals are put to work on the modern task of fencing in the rangeland of Sanjiangyuan.  A group of nomads from the Sichuan border, three days beyond the far hills, walked to the main Xining to Yushu road to collect the fence, supplied free by the Chinese government as a measure perceived to protect the rangeland but criticised for being detrimental to wildlife and culture.Sanjiangyuan - The three rivers headwaters. The Tibetan plateau is the world's third pole, producing fresh water for billions downstream. In China, the future of the nation depends on how this water tower is conserved.  Where the Yangtze, Yellow and Mekong rivers begin, Tibetan nomads are moving to protect the land, its wildlife and in the process their ancient culture from melting away in the face of resettlement and urbanisation..