Gahai Lake is located on Gannan Grassland at an altitude of 3,400 meters. The rippling and clear lake is the top fresh water lake in Gannan Tibetan autonomous prefecture.
The lake is home to 222 species of 30,000 birds. Due to ecological protection, the area of the wetland has expanded to 57,846 hectares. It was approved as national natural reserve by the State Council in 1999.