Which is the deepest river gorge on Earth by some measures?

The Yarlung Tsangpo, also called Yarlung Zangbo and Yalu Zangbu River, is the upper course of Brahmaputra River. It flows through the Tibet Autonomous Region of China and Arunachal Pradesh state of India. It is the longest river of Tibet and the fifth longest in China. The upper section is also called Dangque Zangbu meaning "Horse River".