Quanwan, located on the southwest side of Qinghai Lake, has many spring water surges to form a marsh wetland, and is not frozen in winter, and it is not easy for people and animals to enter. Near the lake shore, 6- 8 kilometers of water grass and plankton are rich, which is the living area of naked moths in Qinghai Lake and is also a habitat for migratory birds. The great swans and black-necked cranes and other rare birds live here.