- Siang River is a major transboundary river flowing through Tibet (China) and Arunachal Pradesh (India).
- Upstream Source: It originates from glaciers near Mount Kailash and Lake Manasarovar in Tibet, where it is known as the Yarlung Tsangpo.
- Entry into India: It cuts through the deep Yarlung Tsangpo Grand Canyon around the Namcha Barwa peak before entering India near Geling and Tuting in the Upper Siang district of Arunachal Pradesh.
- Confluence & Transformation: As it flows south and exits the foothills, it is also referred to as the Dihang. Near Sadiya in Assam, it merges with the Dibang and Lohit rivers to officially form the Brahmaputra.
- Major Tributaries: Key tributaries include the Siyom, Yamne, Simang, and Yargyap Chu.
- Key Hydro Power Project: Siang Upper Multipurpose Project in Arunachal Pradesh.
Source: The Indian Express