By what name is the Brahmaputra River known when it enters Arunachal Pradesh from Tibet near the mountain pass of Gelling?

💡 Solution & Explanation

The Brahmaputra River is known as the Siang (or Dihang) as it crosses the international border from Tibet into the Upper Siang district of Arunachal Pradesh. After receiving major tributaries like the Dibang and Lohit in the Assam valley, it is officially designated as the Brahmaputra. The Dihing and Lohit are separate eastern tributaries, while the Subansiri joins further west. The Siang valley is one of the deepest river gorges in the world.