The Tanggu La, Tangla Pass, or Tanggu Pass (; ) is a wide mountain pass in Southwest China over in elevation, used by both the QinghaiâÂÂTibet Highway and QinghaiâÂÂTibet Railway to cross the Tanggula Mountains. These mountains on the Tibetan Plateau separate the Tibet Autonomous Region from the Qinghai province, and also form part of the watershed separating the Yangtze River to the north from a zone of endorheic basins with internal drainage to the south.
The QinghaiâÂÂTibet Highway reaches its highest elevation of in the Tanggu Pass at . On August 24, 2005, rail track for the QinghaiâÂÂTibet Railway was completed to the WNW of the highway, reaching at . The Tanggula railway station 1 km from this summit is the world's highest at , higher than that of Ticlio, Peru.
The QinghaiâÂÂTibet railway connects the provincial capitals of Xining to Lhasa. The -long section from Golmud to Lhasa was opened on July 1, 2006. The rail cars are equipped with personal oxygen supplies to prevent altitude sickness.