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Dujiangyan in Sichuan near Chengdu has one of the oldest water control systems and an ancient Daoist temple mountain, which have been listed as UNESCO sites. Walking near the river in the city center at night is quite special. The water control system separates water for the city from water for agriculture, and can deal with seasonal fluctuations very well. By now it is more than 2200 years old and still works. This has contributed greatly to the richness of the Chengdu plain, see this Wikipedia article
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Dujiangyan in Sichuan near Chengdu has one of the oldest water control systems and an ancient Daoist temple mountain, which have been listed as UNESCO sites. Walking near the river in the city center at night is quite special. The water control system separates water for the city from water for agriculture, and can deal with seasonal fluctuations very well. By now it is more than 2200 years old and still works. This has contributed greatly to the richness of the Chengdu plain, see this Wikipedia article