Fosi Reservoir is a large reservoir in Yaowobao, Fosi Town, Fuxin Mongol Autonomous County, Fuxin City, Liaoning Province, China, located on the main stream of the Yimatu River. It is the largest flood control and water storage project in Fuxin Mongolian Autonomous County. It is a large (II) type reservoir with multifunctional functions such as flood control, water supply and breeding.