evidence: The South Tibet Valley is formed by the Yarlung Tsangpo River during its middle reaches, where it travels from west to east. The valley is approximately 1,200 km (750 mi) long and 300 km (190 mi) wide. The valley descends from 4,500 m (14,760 ft) above sea level to 2,800 m (9,190 ft). The mountains on either side of the valley are usually around 5,000 m (16,400 ft) high.[19][20] Lakes here include Lake Paiku and Lake Puma Yumco. Government [edit]The Tibet Autonomous Region is a province-level entity of the People's Republic of China. Chinese law nominally guarantees some autonomy in the areas of education and language policy. Like other subdivisions of China, routine administration is carried out by a People's Government, headed by a chairman, who has been an ethnic Tibetan except for an interregnum during the Cultural Revolution. As with other Chinese provinces, the chairman carries out work under the direction of the regional secretary of the Chinese Communist Party. The standing committee of the regional Communist Party Committee serves as the top rung of political power in the region. The current chairman is Yan Jinhai and the current party secretary is Wang Junzheng.