Editing Brahmaputra River (section)

====Arunachal Pradesh====
{{unreferenced section|date=June 2023}}
[[File:Brahmaputra-river-basin.png|thumb|Brahmaputra basin in [[India]]]]

[[File:Sunset in Dibrugarh.jpg|right|160px|thumb|A view of sunset in the Brahmaputra from Dibrugarh]]
The Yarlung Tsangpo leaves the part of Tibet to enter Indian state of [[Arunachal Pradesh]], where the river is called Siang. It makes a very rapid descent from its original height in Tibet and finally appears in the plains, where it is called Dihang. It flows for about {{cvt|35|km|mi|abbr=on}} southward after which, it is joined by the [[Dibang River]] and the [[Lohit River]] at the head of the Assam Valley. Below the Lohit, the river is called Brahmaputra and Doima (mother of water) and Burlung-Buthur by native [[Bodo people|Bodo]] tribals, it then enters the state of [[Assam]], and becomes very wide—as wide as {{cvt|20|km|mi|abbr=on}} in parts of Assam.

The reason for such an unusual course and drastic change is that the river [[Antecedent drainage stream|is antecedent]] to the Himalayas, meaning that it had existed before them and has [[Entrenched river|entrenched itself]] since they started rising.