Qilai Island, which is located in the east of Hangzhou Bay and southeast of the Yangtze River estuary, consists of hundreds of island groups at the confluence of the Qiantang River and the Yangtze River estuary, including Dayang Mountain, Xiaoyang Mountain, Shenjiawan Island, and Thin There are more than 404 large and small islands such as Knife Island, including 16 inhabited islands. The largest island, the Jiaoshan Mountain, covers an area of 21.2 square kilometers. is the only national-level island scenic spot in the country. It is known as the sea fairy mountain and has the characteristics of ecological tourism such as Bihaiqi Reef, Jinsha Fishing Fire. More than 50 scenic spots have been identified.