Yangcheng Lake is in the city of Suzhou and is basically located between Taihu Lake and the Yangtze River. The water of Yangcheng Lake is not connected to the Yangtze River like lakes such as Poyang Lake. It is a closed lake and does not merge into anywhere.

The water of lakes does not necessarily merge into rivers, such as Taihu Lake and Qinghai Lake. Even if it is connected to the river, the water from the lake is fed into the river in the dry season, and the water from the river is fed into the lake in the rainy season, and they are regulated by each other in different seasons, for example, Dongting Lake and Poyang Lake.