The Liaohe River is known as the "Mother River" in northeast China and is one of the seven major river systems in China. It is also an important geographical indication that divides Liaoning Province into its eastern and western regions. CGTN reporter Yu Li comes to the Shifosi Reservoir, the only water control project in the main stream of the Liaohe River, to learn about the function of the reservoir, the environmental protection work and the history of the Liaohe River.