June 5 is World Environment Day. This year's theme is "Building a Clean and beautiful World". In recent years, dongqian Lake system has promoted the water control of lakes, river networks and mountain and pond reservoirs, forming a unique way of water control. Dongqian Lake has not only been listed in the national ecological lake protection pilot, but also been rated as the first national tourist resort and national water conservancy scenic spot. The picture shows pian-pian Egrets inhabiting Dongqian.