Nam Co, located in the middle of the Tibet Autonomous Region, is the second largest lake in Tibet and the third largest saltwater lake in China. The lake is 4,718 meters above sea level, with a rectangular shape, more than 70 kilometers from east to west, more than 30 kilometers wide from north to south, and an area of about 1920 km2. Early scientific research concluded that the maximum depth of Namco was 33 meters, but the re-measurement of the lake in the last two years found that the deepest point of Nam Co was more than 120 meters. The water storage capacity is 76.8 billion cubic meters. It is the largest lake in the world with the highest altitude Namou. The Mongolian name is Tengger Sea, which means Tianhu. Nam Co is one of the three great holy lakes in Tibet. Namtso is the first god lake of the ancient elephant Buddhism, and is one of the famous Buddhist holy places.