Tanggula Mountain:

Tanggula Mountain is the boundary of Tibet Autonomous Region & Qinghai province & stands in the middle section of the Qinghai-Tibet Plateau. Its main peaks are more than 6,000 meters (19680 ft) above sea level. The highest Geladandong peak is 6,621 meters (21716 ft) above seal level. The Tanggula Mountain is the place of origin of the Yangtze River.