The Yarlung Zangbo River cleaves a straight niche from west to east before reaching the juncture of Mainling and Medog counties, where it swerves around towering Namjagbarwa (7,782 meters), the highest peak in the eastern section of the Himalayas, creating the largest, U-shaped canyon in the world. In 1994, some Chinese scientists made an expedition trip along the canyon. Data published by the State Bureau of Surveying and Mapping following the expedition shows that the canyon starts from the Daduka Village, Mainling County in the north to Parcoka Village, Medog in the south. Stretching 504.6 km, the canyon is 2,268 meters deep on average, with the deepest point being 6,009 meters. In September 1998, the State Council officially approved the name of the canyon as "Yarlung Zangbo Daxiagu" (Yarlung Zangbo Grand Canyon).
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（Editor：杜明明、叶欣）
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