Qiandao Lake, that is, Xin'anjiang Reservoir, is located in Chun'an County, Hangzhou City, Zhejiang Province, a small part connected to the northwest of Hangzhou Jiande City, is an artificial lake formed for the construction of Xin'anjiang Hydropower Station to stop the upper reaches of Xin'an River. After the completion of the Xin'an River Reservoir, the dam intercepted the upper reaches of the Xin'an River into a huge lake. The mountains flooded into the lake and became islands of large and small, a total of 1078, so it was called "Qiandao Lake". Qiandao Lake is divided into six tourist areas in Southeast Lake District, Central Lake District, Northwest Lake District, Southwest Lake District, Northeast Lake District, and Shilin Scenic Area. [7] [15-16] [20]1955 Xin'anjiang Reservoir was built. In 1959, Xin'anjiang Hydropower Station closed the hole to store water. In 1960, Xin'anjiang Reservoir was built. On December 15, 1984, the Zhejiang Provincial Geographical Names Committee officially named Xin'anjiang Reservoir as "Qiandao Lake". Qiandao Lake is one of the "three Qiandao Lakes in the world". Qiandao Lake Reservoir dam height is 105 meters, length is 462 meters; the reservoir length is about 150 kilometers, the widest reaches more than 10 kilometers; The deepest reaches more than 100 meters, the average water depth is 30.44 meters, under the normal water level, the area is about 580 square kilometers, and the water storage can reach 17.8 billion cubic meters. At the highest water level, there are 1078 land bridge islands larger than 0.25 square kilometers, and the small islands below 2 square kilometers are mainly. The island area is 409 square kilometers. In 1959, Xin'anjiang Hydropower Station closed the hole to store water, and flooded the original Chun'an County, Yucheng (also known as Hecheng), and the original Sui'an County, Shicheng, two counties in the town of Duozhen. Later, the two counties of Chun'an and Sui'an were merged into Chun'an County, which belonged to Hangzhou City. 1