Reservoir introduction: A giant reservoir formed after the interception of Ertan Hydropower Station. This lake is 1,200 meters above sea level, 145 kilometers long, and more than 700 meters wide. It is a T-shaped artificial lake with 5 small islands and more than 10 peninsulas echoing each other. , the furthest you can reach Yanyuan County by boat, which is comparable to the famous Three Gorges of the Yangtze River.