Karez - or more properly the canal feeding karezes (wells)

Two millennia ago the high level of traffic on the Silk Road meant Turpan needed good water supply for humans, animals and agriculture.
Water from the Tienshan rivers was brought through a complex network of underground canals which linked karezes where water was drawn.
Today much of the network is still operational with 1,100 wells and about 3,000 miles of channels in use for general and irrigation purposes.

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