The Dianchi Lake, named as South Dian Pool in ancient times, commonly known as the Kunyang Sea or the Kunyang Lake, is the largest lake in Yunnan Province and the 6th largest freshwater lake in China.

Covering an area of 294 square kilometers, the Dianchi Lake has an average depth of 4.4 meters with the deepest point of about 10 meters. Converging more than 20 rivers such as the Nanpan River and the Baoxiang River, the lake has its outlet in Haikou. After running through the Tanglang River and the Pudu River, it flows into the Jinsha River. The Dianchi Lake is a natural cistern, with a water-storage of 15 cubic meters.