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In page Tibet Autonomous Region:

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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.[4][5] Lakes here include Lake Paiku and Lake Puma Yumco.[citation needed]