Xuanwu Lake is located outside the northeast wall of Nanjing, and is connected with the urban area through Xuanwu Gate and Jiefang Gate. 1909 became a park. At that time, it was called Wuying Lake Park, also called Wuzhou Park and Houhu Lake. The shore of Xuanwu Lake is rhombic, with a circumference of about 10 km, an area of 437 hectares and a water surface of about 368 hectares. There are five islands in the lake, which divide the lake into four blocks, and there are bridges or dikes between the islands, which is convenient for sightseeing. The depth of this lake is no more than two meters. Fish and lotus are planted in the lake. In summer and autumn, the water is green and pink lotus flowers are hidden among them. The lake is fragrant and the scenery is charming.