called Wuding River , literally "unfixed river", because its flow was irregular. When the Kangxi Emperor reigned, he enacted various hydraulic engineering projects in the region to rein in the seasonal flooding. After those projects, the river was renamed to its modern name, which means "ever-fixed river".

Geography

The Yongding River is 650 km in length and drains an area of 47,016 km2. It emerges from the Guancen Mountains (???) in Ningwu County,

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