Introduction to Wetland Lake Island: Chagan Lake is a key wetland nature reserve and a paradise for many rare birds to breed and migrate. The island in the center of the lake is strip-shaped and slightly curved. It will be exposed on the lake surface when the water level is 130 meters, and will be basically submerged by the lake water when the water level is 132 meters. The island is often covered with plants such as cattail grass, reeds and weeds. From a distance, it looks green and charming.