Brahmaputra River: The Great River of India's Northeast Border

The Brahmaputra River is the major river running along India's northeastern border, though its course is more complex than a simple boundary.

Course & Geography

• Source: Angsi Glacier, Tibet (Chemayungdung Glacier area), ~5,300 m elevation
• Tibet (Yarlung Tsangpo): Flows east 1,700 km along suture zone
• Great Bend: Turns south, carves world's deepest canyon (Yarlung Tsangpo Grand Canyon)
• India (Arunachal Pradesh/Assam): Enters as Siang/Dihang, becomes Brahmaputra
• Assam Valley: Braided channel 10–16 km wide, massive sediment load
• Bangladesh (Jamuna): Merges with Ganges (Padma) → Meghna → Bay of Bengal

Border Role

• Forms parts of India-China (disputed) and India-Bangladesh boundaries
• In Assam, it's internal to India, not a border
• Major tributaries: Subansiri, Manas, Sankosh, Teesta, Dhansiri

Significance

• Length: ~2,900 km (1,800 mi) total; ~916 km in India
• Discharge: ~19,800 m³/s (4th globally)
• Sediment: ~400M tons/year — builds Bangladesh delta
• Hydropower: Massive potential (controversial dams planned)
• Culture: Sacred in Hinduism; Majuli island (largest river island)

Note on "North-East Border"

The Brahmaputra does not run the entire NE border. The McMahon Line (Himalayan crest) and other rivers (Lohit, Dibang) define much of the Arunachal boundary with China.