The Yimin River originated from the north of the mushroom mountain in Da Hinggan Mountain, flowing from south to north, straddling the Ewenki Autonomous Banner, passing through Hailar City, and entering the Hailar River under the Beishan Mountain in Hailar City. The tributaries of the Benhe River Basin are mostly distributed on the right bank, and the larger tributaries from the top to bottom include the Weina River, the Weizikeng River, and the Seni River. The Yimin River is359.4 kilometers long, the basin area is 22,640 square kilometers, and the annual runoff is 12.75 billion cubic meters. From the south to the north, the Ewenki Autonomous Banner runs through the urban area of Hailar District, and the Hailar River is merged into the Hailar River in the north of the city of Hailar District. Standing at the entrance of the Manzhouli Anti-Fascist War Memorial Hall, you can see the beautiful river view.