Yatsusawa Hydroelectric Power Plant

This is a canal-type hydroelectric power plant constructed during the Meiji period to meet the long-distance power transmission needs of the Tokyo metropolitan area. The approximately 14km stretch from the water intake to the power plant consists of a series of civil engineering structures including aqueducts, tunnels, and regulating reservoirs, and is still used for power generation today. It holds significant historical value in the history of civil engineering and is designated as a National Important Cultural Property (structure).