The Yuer River is the largest tributary on the right bank of the Nenjiang River. It is located in the Hinggan League of Inner Mongolia and northwest of Jilin Province. It originates from the Jiudaogou, Gaoyueshan Bailang Forestry Bureau, southeast of the Aershan Mountain, Daxinganling, Inner Mongolia. It is composed of 10 small rivers of different sizes. The southeast flows through Keyouqianqi, Ulanhot City, Weinan City, Zhenyu County, and the moon bubble is injected into the north of Da'an City and then flows into the Nenjiang River. It is 553 kilometers long and the basin area is 3.08 10,000 square kilometers. From northwest to southeast flow to Ulanhot to gather the return river, to Jilin Province Weinan City to the northeast into the Nenjiang River.