Laixi Lake, also known as Chanzhi Reservoir. Located in the middle and upper reaches of the main stream of Dagu River, 10 kilometers away from the urban area of ??Laixi, it was built in 1958. It is a comprehensive national large-scale reservoir integrating flood control, irrigation, water supply, fish farming and tourism. The reservoir dam is 2.5 kilometers long, with a drainage area of ??879 square kilometers, a maximum water area of ??56 square kilometers, and a total storage capacity of 402 million cubic meters. It is the largest reservoir in the Jiaodong Peninsula. Since the reservoir was built, it has played an important role in local flood control and drought relief. Over the past 40 years, it has not only resolved previous flood disasters, but also used its abundant water storage to support industrial and agricultural production, making immeasurable contributions to local economic development. The reservoir currently has 4 irrigation areas under its jurisdiction, including Nianzhitou, with an irrigable area of ??300,000 acres. It also has many industrial and domestic water channels in Qingdao and Laixi City, with an annual water supply of 50 million cubic meters. In addition to its great role in flood control and irrigation, Chanzhi Reservoir also develops freshwater aquaculture. The current aquaculture water surface reaches 25,000 acres, and there are mainly more than 20 species such as Lu fish and sturgeon. In recent years, another valuable fish - big whitebait - has been developed, and its economic benefits are very considerable. The reservoir also has a fish seed farm, with a fry hatching pool of 200 acres, and an annual hatching capacity of 30 million fish. It is a fry and fish seed production base for surrounding counties and cities. In recent years, the Reservoir Management Bureau has also increased the development and utilization of tourism resources, and has successively developed tourist projects such as scenic spot tours, water sightseeing, and Long Beach fishing, becoming important tourist attractions in Qingdao and the Shandong Peninsula