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永定河是海河流域五大水系之一。上源有两支:南支为桑干河,发源于山西省宁武县管涔山,东流纳黄水河、浑河、御河等进入河北省境内再纳壶流河,长437公里;北支为洋河,发源于内蒙古兴和县,于河北省境内张家口市纳清水河,长278公里。原两支于河北省怀来县朱官屯汇流,汇流后始称永定河。自官厅水库建成后,两支均汇入官厅水库。经官厅水库调节后,再经官厅山峡至北京市三家店
Yongding River is one of the five major river systems in the Haihe River Basin. There are two on the source: the southern branch of the Sanggan River, originated in Shanxi Province, Wuwei Mountain Nunnery, the East Yuna Huangshui River, Hunhe, Yuhe into the territory of Hebei province and then Nahu River, 437 km long; north Branch for the Yang River, originated in Xinghe County, Inner Mongolia, Zhangjiakou City in Hebei Province within the Nashui River, 278 km long. The original two in Hualai County, Hebei Province, Zhu Guantun confluence, said confluence Yongding River. Since the completion of the Guanting Reservoir, both of them have been re-introduced into the Guanting Reservoir. Regulated by the government hall reservoir, and then by the government to the Beijing Sanxia store