Lop Nor, the lake in the southeast of Xinjiang Uygur Autonomous Region, China, is known as the "ear of the earth" because of its shape as a human ear, and is also known as the "sea of death", also known as the "nào", the "Shanhaijing" called "youze", also known as Heze, Yanze, Changhai, Yanze, Lanlanhai, Furihai, Linhai, Lopchi, Robchi and other names. Robgar is a Mongolian pronunciation translation, meaning a lake with many water pools, about 780 meters above sea level, located at the lowest point in the eastern Tarim Basin, the easternmost edge of the Taklamakan Desert, northern Ruoqian County, Bayingol Mongolia Autonomous Prefecture, southeast, center is located in the north latitude 40.5 °, east longitude 90.3 °. The Tarim River, Peacock River, Cheerchen River, Shule River and so on are gathered here, it is the second largest saltwater lake in China, with an area of about 2400-3000 square kilometers. There is more lake water before 330 AD, The northwest side of Loulan City is the famous "Silk Road" throat, and then due to climate change and human water conservancy project impact, the upstream water is reduced until dry, now only a large salt shell.