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永济渠北段具体行迹自独流口西北折,循拒马河至信安桑乾河河口,再经桑乾河上溯至永清县东境,开渠至安次(旧州),西北入桑乾河北支(即清泉河),循洗马沟抵蓟城。永济渠是沟通桑乾河南支与北支的水利工程。
The north section of Yongji Ditch goes through the northwestern fold of the Allegiance and repels the Mahe River to the Sanshan River estuary of the Xinanshan River. It then goes back to the east of Yongqing County via the Sanggan River and opens to Anci (Old State) Sanggan Hebei branch (that is, Chingchuankuang), Xizhi Ma ditch to Ji City. Yongji Qu is to communicate Sanggan Henan branch and North Branch of the water conservancy project.