Wikipedia
Chenghai (lake)
Chenghai Lake is a plateau lake in Yunnan Province，southwest of China. The lake has a total area of about 77.22 square kilometers. The average depth is 25.7 m, with an elevation of 1503 m. the water storage capacity is about 19.87×10m. Chenghai Lake is one of only three lakes in the world where Spirulina is found naturally.