永定河《水经注》称湿水、治水、漯水,又称浑河、卢沟河,俗称无定河。从清康熙三十七年(1698年)在卢沟桥以下至狼城河口两岸筑堤后,始命名为永定河。上游有南北两条主要支流,南支称桑干河,发源于山西宁武县。北支称洋河,发源于内蒙古兴和县,汇流于河北省怀来县朱官屯。在官厅又 Yongding River “water by Note” said wet, water treatment, Luo water, also known as the Hun River, Lugouhe, commonly known as Wuding River. From the Qing Emperor Kangxi thirty-seven years (1698) below the Lugouqiao to the wolves mouth estuary embankment, was named Yongding River. There are two major north-south tributaries of the tributaries of the South Branch Sanggan River, originated in Shanxi Ningwu County. North Branch said Yang River, originated in Xinghe County, Inner Mongolia, confluence in Huailai County, Hebei Zhu Zhuantun. In the official hall again