The river is located in Hainan Tibetan Autonomous Prefecture, Qinghai Province, about 40 kilometers in length, and flows from east to west, flowing into Qinghai Lake, which is different from most rivers from west to east, so the name is the river. The river originated in the Chahan grassland of Shanxi, the sun and moon, the river is winding, the river is crystal clear, and it looks like a bright ribbon floating on the grassland.