The Qinhuai River is located in the southwest of Jiangsu Province, a tributary of the lower reaches of the Yangtze River, about 110 kilometers in length, and the total area of the basin is 2630 square kilometers, which is the main river in Nanjing. The outer Qinhuai River is the Wuyang City, which was disconnected a thousand years ago, and the barrier to the south and west outside the ancient city of Nanjing, is now the river in the city. The Qinhuai River outside the south city by Tongjimen through the Chinese Gate, the east, south, west three sides, flow through the Chinese Gate, through the Hanzhong Gate, the pasture gate, Dinghuai Gate, follow the stone city north to the Sanyu River into the Yangtze River.