The Molgler River, also known as the Molgler River, Molggen River, and Molggen River, originated in the Chen Barhu Banner in Hulunbuir City, Inner Mongolia Autonomous Region, and is known as the "first water in the world". The river is 319 kilometers long and the basin area is 4,987 square kilometers. It flows from the northeast to the southwest through the famous Hulunbuir prairie, injects Huhe Noor Lake and flows out into the Hailar River, which belongs to the Erguna River system of the China-Russia border river.