Located in the west of Weining County. Cao Hai is a freshwater lake at 2,170 m, with a rich growth of water plants in the lake, and marshes and meadows.
Non-bird biodiversity: The amphibian Rana weiningensis is endemic to this area.
BirdLife International (2020) Important Bird Areas factsheet: Cao Hai Nature Reserve. Downloaded from http://www.birdlife.org on 04/12/2020.