Namtso
Namtso or Lake Nam (officially: Nam Co; Mongolian:Tenger nuur; “Heavenly Lake”; in European literature: "Tengri-Nor", 30°42′N 90°33′E / 30.700°N 90.550°E) is a mountain lake on the border between Damxung County of Lhasa prefecture-level city and Baingoin County of Nagqu Prefecture in the Tibet Autonomous Region of China, approximately 112 kilometres (70 mi) NNW of Lhasa.