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永定河,古称无定河、浑河,属全国四大防洪江河之一的海河水系,在北京境内流经门头沟、石景山、丰台、房山、大兴5个区,河段长约170 km,流域面积近3 200 km2,占到北京市流域总面积的20%。永定河位于北京西部地区,是北京西部地下水的主要补给源,千百年来她哺育了北京这个古老的城市。永定河为北京的环境和人类生活提供了水源。她的生命之水,在北京的形成、发展、繁荣过程中发挥了不可替代的作用。永定河出山以后,由北往南历经迁移,在古河道上留下众多湖泊和洼地,是北京古典园林形态和生机的源泉。
Yongding River, the ancient name Wuding River, Hunhe, is one of the four flood-control rivers in the Haihe River system in Beijing through the Mentougou, Shijingshan, Fengtai, Fangshan, Daxing 5 District, about 170 km of the river, the drainage area Nearly 3 200 km2, accounting for 20% of the total area of Beijing basin. Located in the western part of Beijing, Yongding River is the main supply source of groundwater in western Beijing. She has nurtured the ancient city of Beijing for thousands of years. Yongding River provides water for the environment and human life in Beijing. The water of her life has played an irreplaceable role in the formation, development and prosperity of Beijing. After Yongding River went out from north to south, it has been relocated and many lakes and depressions have been left on ancient rivers, which is the source of the shape and vitality of Beijing’s classical gardens.