Lashihai Lijiang county is located 8 kilometers west of Rafah City, Pa, is the first in Yunnan Province in order to "wetlands" named as a nature reserve. "La City" as the translation of the ancient Naxi language, "pull" for the shortage of dam, "City" for the new, which means the shortage of the new dam. Northwest Yunnan here was part of the ancient geosyncline, Mesozoic Yanshan fold uplift movement into the land, to become a Miocene peneplain, with the development of cross-sectional Range orogeny, to the late Pliocene to early Pleistocene, the quasi - plain and is separated into three relative elevation in the 100-200 m of altitude mountain basins, namely Lashi dam, Lijiang Dam, seven dam. Rafah City is one of the highest dam dam, dam water in a still, they said Lashihai, lake 2437 meters above sea level.

       Lashihai Lake, as the fault structure, but also by the dissolution of limestone by tectonism. Lake surface water sources are the south side of River and River on the north side of the United States. Wenhui water area of 265.6 square kilometers of water, the lake from the northwest side of the original leak of the cave. The past, a significant seasonal variation of the lake, the water level high during the rainy season, the largest storage capacity 180 million cubic meters, the water nine square kilometers with water depth up to 9 meters; the dry season the water level dropped, and even dry up. Since the 80's, have irrigation, built in the hole before a tall dam, the water can no longer flow freely, but from the opening whistle Haidong Huangshan water tunnel, the inflow of Lijiang City. Lashihai Lake from season to maintain a certain level into a plateau of lakes, the lake is like a mirror reflection of the Yulong Snow Mountain, wintering waterfowl habitat Enron, or the blue sky and white clouds hovering in between the high altitude wetlands constitute a unique atmosphere.

        According to the survey, currently in Lashihai wetlands total of 57 kinds of birds each year to the birds this winter there are about 30,000 of them unique to nine kinds of rare and endangered birds, including the Qinghai-Tibet Plateau endemic birds of Bar-headed Goose, at the national level to protect birds type of Chinese merganser, black-necked cranes, black cranes and so on. Thus, the provincial government in June 1998 approved the establishment of formal Lashihai Lijiang, Yunnan Plateau Wetland Nature Reserve, including Lashihai, the sea, Yoshiko reservoirs, such as writing Reservoir Area 4, the total area of 6523 hectares, the main part of Lashihai Area, covering an area of 5330 hectares, as a habitat for migratory birds of paradise.