Qinghai Lake is located in the northeastern part of the Qinghai-Tibetan Plateau, with an elevation of 3,196 meters above sea level, an average depth of 18.6 meters and a maximum depth of 32.8 meters, and a shoreline of 360 kilometers. East-west length of 106 kilometers, north-south width of 63 kilometers, an area of 4,583 square kilometers, the lake's water capacity is 85.4 cubic kilometers. More than 40 rivers, including the Buha River and the Ganzi River, are injected into it. Qinghai Lake has no outflow outlet, so it has become the largest inland saltwater lake in China. Qinghai Lake about 200 to 200,000 years ago due to crustal movement and the formation of a break in the lake basin, the lake basin water began to flow into the Yellow River, and then because of the surrounding mountains rise, Yin plug the lake outflow, will form today's inland lakes.