Explanation

The Yarlung Tsangpo, flowing east across Tibet, takes a spectacular U-turn around Namcha Barwa (the ‘Great Bend’) and plunges through deep gorges to enter Arunachal Pradesh, where it is called the Siang or Dihang; in Assam it becomes the Brahmaputra. The Ganga, Yamuna and Sutlej have no such bend at Namcha Barwa. Hence the Brahmaputra.