海河流域七大水系之一北京市第一大河河北水系的最大河流永定河,古称澡水,东汉称漯水,隋代称桑干河,金代称卢沟,元、明代有浑河、小黄河等别称。历史上,由于河道迁徙无常,俗称无定河。由于水能资源丰富,流域广泛,恩泽一方,永定河又以“北京的母亲河”、海河流域的七大水系之一、北京市第一大河、河北水系的最大河流而著称。桑干河因为丁玲的《太阳照在桑干河上》而闻名天下。永定河发源于山西省宁武县管涔 Haihe River Basin, one of the seven major waterways in Beijing, the largest river in Hebei River Yongding River, the ancient name of the bathing water, the Eastern Han Dynasty called Luo Shuang, Sui said Sanggan River, Jin said Lugou Yuan, Ming Dynasty Hun River, the Yellow River nickname. Historically, due to the migration of rivers impermanence, commonly known as no river. Due to its rich water resources and extensive river valleys, the Yongze River is also known as the “Mother River of Beijing”, one of the seven major water systems in the Haihe River Basin, the largest river in Beijing and the largest river in Hebei. Sanggan River because Ding Ling’s “sun shines on the Sanggan River” and world-famous. Yongding River originated in Ningwu County, Shanxi Province Pipe 涔