Qiantang River is the largest river in Zhejiang Province, the name of the two Zhejiang roads in the Song Dynasty, and the name of the province when Zhejiang Province was founded in the early Ming Dynasty. From Xin'an River in the north, the river is588.73 kilometers long; from Ma Jinxi, the upper reaches of the Lijiang River in the south, the river is522.22 kilometers long. Since the source, it flows through the southern Anhui Province and Zhejiang Province, and the basin area is 5,5058 square kilometers, and it is injected into the East China Sea through Hangzhou Bay. The Qiantang River tide is known as the "first tide in the world", is a natural wonder in the world, it is the centrifugal effect of the gravity of the celestial body and the rotation of the earth, plus the special terrain of the Hangzhou Bay horn mouth caused by the extraordinary tide.