Foto de stock - Turfan Depression of Xinjiang, China Irrigation is by karez, a system of shafts and subterranean aquaeducts, which function as horizontal wells that collect and carry snow and glacier melt from the nearby Tian Shan mountain range to appointed oases and fields The karez system, avoiding pumps and relying on natural gravity, is most propably modelled on Persia´s qanats

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