Brahmaputra River System UPSC

The Brahmaputra River System is one of the largest and most powerful river systems of Asia. It plays a crucial role in the physical geography, economy, culture, and ecology of India and its neighbouring countries. Known for its massive water volume, wide braided channels, and frequent floods, the Brahmaputra shapes the landscape of the eastern Himalayan and north-eastern regions of the Indian subcontinent. The river is unique because it flows through three countries, changes its name in different regions, and follows a complex course through some of the world’s most rugged terrain.

Brahmaputra River System Map

Origin of Brahmaputra River

• The Brahmaputra originates in the Angsi Glacier near Mount Kailash in the Tibetan Plateau of China.
• Earlier, the Chema Yungdung Glacier was believed to be the Brahmaputra’s source, but research in 2011 confirmed the Angsi Glacier as the actual origin, though some older sources still list Chemayungdung.
• The source region lies at an altitude of about 5,300 meters (16,900 ft) above sea level.
• Its source lies in proximity to the origins of the Indus and Sutlej rivers.

Course of Brahmaputra River

The Brahmaputra River, one of the largest rivers in Asia, flows through Tibet, India, and Bangladesh, covering a distance of nearly 2,900 km. It originates from the Angsi Glacier in the Tibetan Plateau as the Yarlung Tsangpo, flows eastward across Tibet, makes a dramatic U-turn near Namcha Barwa, and enters India through Arunachal Pradesh as the Siang. In Assam, it becomes the Brahmaputra, meandering through wide floodplains before entering Bangladesh as the Jamuna, where it eventually joins the Ganga (Padma) and Meghna rivers, forming the world’s largest delta before emptying into the Bay of Bengal.

Course of Brahmaputra River in Tibet (China)

• The Brahmaputra is known as the Yarlung Tsangpo (Tsangpo) in Tibet.
• The river flows eastward along the northern side of the Himalayas in Tibet.
• It runs between the Himalayas to the south and the Trans-Himalayan ranges to the north.
• The valley through which it flows is called the Tsangpo Valley.
• The river maintains a gentle gradient in its upper course.
• It receives meltwater from Himalayan glaciers and seasonal rainfall.
• Near Namcha Barwa (7,782 m), it forms one of the deepest gorges in the world.
• At this point, the river makes a dramatic U-shaped bend around the mountain.
• After this bend, it turns southward towards India.
• It travels for nearly 1,700 km in the Tibetan region before entering India.

Course of Brahmaputra River in India

• In India, the river travels approximately 916 km, mainly through Arunachal Pradesh and Assam.
• The Brahmaputra River enters India near the village of Gelling in the Upper Siang district of Arunachal Pradesh.
• In this region, it is known as the Siang or Dihang River.
• It flows southward through the Siang Valley.
• The river is joined by two major Himalayan tributaries – the Dibang and Lohit.
• After this confluence, it is called the Brahmaputra in Assam.
• The river flows westward across the Assam Valley.
• It forms wide, braided channels with numerous sandbars (chars).
• The river causes frequent floods and erosion in Assam.
• Majuli Island, once the world’s largest river island, lies in its course.
• The Brahmaputra receives many tributaries like Subansiri, Manas, Kameng, and Dhansiri.
• Near Dhubri, the river turns southward towards Bangladesh.

Course of Brahmaputra River in Bangladesh

• The final stretch in Bangladesh spans about 375 km, where the river is called the Jamuna.
• It enters Bangladesh near Kurigram district (Bangladesh).
• The river flows southward across the Brahmaputra–Jamuna floodplain.
• It maintains a wide, braided channel with shifting sandbars.
• The Teesta joins the Jamuna (Brahmaputra) on its right bank, north of Fulchhari Ghat in the Gaibandha district of Bangladesh.
• The Jamuna (Brahmaputra) later joins the Padma (Ganga) near Goalundo Ghat in Bangladesh.
• After this confluence, the combined river flows as the Padma.
• The Padma then meets the Meghna River near Chandpur.
• Together, they form the world’s largest delta system.
• The river finally empties into the Bay of Bengal.
• The Jamuna causes frequent floods but also deposits fertile alluvium.

Tributaries of Brahmaputra River

The Brahmaputra River is fed by a large network of tributaries that originate from the Himalayas, Trans-Himalayan ranges, and the hills of Northeast India. These tributaries supply enormous volumes of water, sediments, and nutrients, making the Brahmaputra one of the most powerful and dynamic river systems in the world. They play a crucial role in shaping the river’s wide floodplains, supporting agriculture, and maintaining the rich biodiversity of the region.

Left Bank Tributaries of Brahmaputra River

The main left bank tributaries of the Brahmaputra River include the Lohit, Dibang, Subansiri, Dhanashri, Kolong, Kopili, Burhi Dihing, Desang, Dikhow, and international rivers like the Lhasa River, Nyang River, and Parlung Zangbo in its upper reaches. These tributaries contribute significantly to the river’s water volume as it flows through Tibet, Arunachal Pradesh, and Assam.

Left Bank Tributary	Origin Area	Region / Country	Confluence with Brahmaputra	Key Notes
Lhasa River	Nyenchen Tanglha Range	Tibet (China)	Near Lhasa	Important tributary in upper course; glacier-fed
Nyang River	Eastern Himalayas	Tibet (China)	Near Nyingchi	Second largest tributary; glacier-fed; contributes water from Tibet
Parlung Zangbo	Eastern Himalayas	Tibet (China)	Before Namcha Barwa bend	Major Himalayan tributary in upper course; largest tributary on left side
Lohit River	Zayul Range	Tibet, Arunachal Pradesh, Assam	Near Sadiya	Forms Brahmaputra with Siang & Dibang; large sediment load
Dibang River	Mishmi Hills	Arunachal Pradesh, Assam	Near Sadiya	Joins Lohit near Sadiya before becoming Brahmaputra; largest tributary by discharge; prone to flooding
Dhansiri (South)	Lysang Peak, Nagaland	Nagaland, Assam	Dhansirimukh (Assam)	True left-bank Dhansiri; flows northward; forms border between Nagaland and Assam districts
Burhi Dihing	Patkai Hills	Assam	Dihingmukh, near Dibrugarh	Important for floodplain irrigation; oil-rich region; Namdapha River is tributary
Kopili River	Khasi Hills, Meghalaya plateau	Assam, Meghalaya	Kopilimukh, Nagaon district	Hydropower potential; flood-prone tributary; National Waterway-57
Kolong (Kollong)	Brahmaputra distributary	Assam	Kolongpar near Guwahati	Floodplain tributary; divides Nagaon city
Desang	Patkai Hill Ranges, Arunachal Pradesh	Arunachal Pradesh, Assam	Sivasagar district, near Sapekhati	Known as Tisa river at source; contributes to local floods
Dikhow	Naga Hills	Assam	Dikhowmukh in Sibsagar	Flood-prone; joins in upper Assam plains

Right Bank Tributaries of Brahmaputra River

The main right bank (northern) tributaries of the Brahmaputra River in India include the Subansiri, Kameng, Manas, Beki, Raidak, Jaldhaka, Teesta, Sankosh, and Siyom rivers, all flowing from the Himalayas, adding significant water and sediment to the Brahmaputra as it traverses the Assam plains before entering Bangladesh.

Right Bank Tributary	Origin Region	State / Country Covered	Confluence with Brahmaputra	Key Features / Notes
Subansiri	Tibet (China)	Arunachal Pradesh, Assam	Near Lakhimpur, Assam	Largest tributary by discharge (nearly 8%), known as the “Gold River” for for gold dust deposits, Popular for kayaking, Subansiri Lower Dam located on this river
Kameng (Jia Bharali)	Gori Chen mountain area, Tawang district, Arunachal Pradesh	Arunachal Pradesh, Assam	Near Tezpur, Assam	known as Jia Bharali in Assam, Contributes heavy sediment load
Manas	Bhutan Himalayas	Bhutan, Assam	Near Jogighopa, Assam	Named after the serpent deity Manasa, A significant transboundary river, known as Drangme Chhu in Bhutan, Flows through Manas National Park, Lifeline for Manas National Park (India) and Royal Manas National Park (Bhutan)
Beki	Bhutan Himalayas	Bhutan, Assam	Near Barpeta, Assam	Known as the Kurissu River in Bhutan, Important flood-contributing tributary, Enters India near Manas National Park in Assam
Raidak	Bhutan Himalayas	Bhutan, India (West Bengal), Bangladesh	Kurigram District in Bangladesh	Known as Wang Chhu in Bhutan, A transboundary river, Known for Chukha Hydroelectric Project (Bhutan), Borders Neora Valley National Park, Gorumara National Park, and Buxa Tiger Reserve in West Bengal.
Jaldhaka	Bitang Lake (also known as Kupup Lake), Gangtok District, Sikkim	India (Sikkim, West Bengal) Bhutan, and Bangladesh	Enters Brahmaputra system in Bangladesh	It flows from Sikkim into Bhutan, re-enters India (West Bengal), and then enters Bangladesh, Forms part of the India-Bhutan border, Known as Dichu in Bhutan and Dharla (or Singimari) in Bangladesh, It passes through Neora Valley National Park, Chapramari Wildlife Sanctuary and Gorumara National Park in West Bengal
Teesta	Tso Lhamo Lake, Sikkim	India (Sikkim, West Bengal), Bangladesh	Joins Jamuna (Brahmaputra) in Bangladesh	Major transboundary river, Known for flash floods, Major projects like Teesta-V, Teesta-III, and Teesta Low Dam
Sankosh	Forms in Bhutan from the confluence of Mo Chhu and Pho Chhu	Bhutan, Assam	Near Dhubri, Assam	Also known as Puna Tsang Chu in Bhutan, Flows through narrow gorges in Bhutan, It serves as a natural boundary between Assam and West Bengal
Torsa	Chumbi Valley, Tibet (China)	Tibet, Bhutan, India (West Bengal), and Bangladesh	Meets with the Jamuna in Bangladesh	Also known as Machu (in Tibet), Amo Chhu (in Bhutan), and Teesta (in Bangladesh)
Siyom	Upper Siang region, Arunachal Pradesh	Arunachal Pradesh	Joins Siang (Brahmaputra) in Arunachal	The Mouling National Park is located on the east bank of the river. Known for its scenic valleys and adventure tourism (rafting/kayaking)

Different Names of Brahmaputra River

The Brahmaputra River is known by different names along its course. In Tibet, it is called the Yarlung Tsangpo. As it enters Arunachal Pradesh, it is known as the Siang or Dihang. In Assam, it is called the Brahmaputra, and in Bangladesh, it is the Jamuna, which joins the Padma (Ganges) to form the Meghna before emptying into the Bay of Bengal.

Region	Local Name(s)	Notes / Additional Info
Tibet (China)	Yarlung Tsangpo (or Tsangpo)	Name in the upper reaches; originates from the Angsi Glacier
Arunachal Pradesh (India)	Siang or Dihang	Name used as the river enters India; flows through the Siang Valley
Assam (India)	Brahmaputra	Name used throughout Assam; forms wide braided channels and floodplains
Bangladesh	Jamuna (western branch)	Joins the Padma (Ganges) and then becomes Meghna before flowing into the Bay of Bengal

States Covered by the Brahmaputra River in India

The Brahmaputra River flows through several Indian states, primarily in the Northeast: Arunachal Pradesh, where it enters India as the Siang/Dihang, and Assam, where it becomes the Brahmaputra, before entering Bangladesh, also touching parts of West Bengal, Meghalaya, Nagaland, and Sikkim within its vast basin.

State	River Name / Section	Region / Area	Key Features / Notes
Arunachal Pradesh	Siang / Dihang	Northeast India	Enters India here; flows through narrow valleys; steep gradient; hydroelectric potential
Assam	Brahmaputra	Brahmaputra Valley	Wide braided channels; major floodplains; river islands like Majuli; receives major tributaries
Nagaland	Dhansiri (South tributary)	Northeast India	Tributary from Naga Hills; joins Brahmaputra near Golaghat; flood-contributing river
Meghalaya	Kopili, Dhodnoi tributaries	Northeast India	Tributaries from Khasi & Meghalaya Plateau; contribute water and sediment
Sikkim	Teesta tributary	Northeast India	Flows into Brahmaputra in Bangladesh as Jamuna; important for hydropower
West Bengal	Tributary basins only	Eastern India	Some northern Himalayan tributaries (like Jaldhaka) flow through here before joining Brahmaputra in Bangladesh

Brahmaputra River Basin

The Brahmaputra River Basin is a vast, transboundary drainage area covering Tibet (China), India, Bhutan, and Bangladesh, originating in the Himalayas and flowing about 2,900 km before joining the Ganges in Bangladesh, forming a vital, fertile, and flood-prone region known for its rich biodiversity, agriculture (especially rice), and significant hydropower potential, supporting millions with heavy monsoon-driven flows and unique braided channels in its plains.

Country-wise Drainage Area of the Brahmaputra River

Country	Drainage Area (sq km)	Percentage of Total Basin	Notes / Water Contribution
China (Tibet)	~2,93,000	~50.5%	Upper course (Yarlung Tsangpo); largest area but lower water contribution
India	~1,95,000	~33.6%	Arunachal Pradesh, Assam, parts of Sikkim, Meghalaya, Nagaland; contributes over 80% of total water yield due to heavy monsoon
Bangladesh	~47,000	~8.1%	Lower course as Jamuna; fertile floodplains and delta region
Bhutan	~45,000	~7.8%	Himalayan tributaries like Manas, Raidak, Sankosh; moderate contribution to flow
Total	~5,80,000	100%	Entire Brahmaputra basin from Tibet to Bay of Bengal

State-wise Drainage Area of the Brahmaputra River

State	Drainage Area (sq km)	Percentage of Indian Basin	Notes / Key Features
Arunachal Pradesh	~81,424	~41.9%	Largest share of the Indian basin; river enters India here as Siang/Dihang; steep Himalayan terrain
Assam	~70,634	~36.4%	Second largest share; Brahmaputra flows across wide floodplains; braided channels and river islands like Majuli
West Bengal	~12,585	~6.5%	Northern Himalayan tributaries flow through here before entering Bangladesh
Meghalaya	~11,667	~6.0%	Tributaries like Kopili and Dhodnoi originate from Khasi & Meghalaya Plateau
Nagaland	~10,803	~5.6%	Dhansiri (South) tributary contributes to Brahmaputra flow in Assam
Sikkim	~7,300	~3.8%	Teesta tributary flows into Brahmaputra system in Bangladesh; high hydropower potential
Total (India)	~1,94,413	100%	Indian portion before entering Bangladesh; main water contributor due to heavy monsoon rainfall

Dams on Brahmaputra River

The Brahmaputra River, one of Asia’s largest rivers, flows through China (Tibet), India, and Bangladesh. Due to its steep gradients in the Himalayas and heavy monsoon flows, it has significant potential for hydroelectric power generation. While the main river in Tibet (Yarlung Tsangpo) hosts several large dams and hydro projects, most of India’s dams are built on tributaries rather than the main river. These dams serve purposes such as hydropower, irrigation, and water management, and several new projects are planned or under construction in both China and India.

Dams on Brahmaputra River in China (Tibet)

Dam / Project	River / Location	Notes
Zangmu Dam	Brahmaputra (Yarlung Tsangpo)	First major dam on main river; 510 MW hydroelectric capacity, Operational since 2015, located near Gyaca in Tibet, Gravity dam, Run-of-the-river
Jiacha Hydropower Station	Brahmaputra (mid-reaches)	360 MW; Downstream of Zangmu
Dagu Dam	Brahmaputra (upper reaches)	Part of planned cascade on Yarlung Tsangpo
Jiexu Dam	Brahmaputra (upper reaches)	Planned dam on upper course
Pangduo Hydropower Station	Lhasa River	Upstream project, Lhasa River is a major tributary of the Yarlung Zangbo River (Brahmaputra) in Tibet
Lalho Hydroelectric Project	Xiabuqu tributary	42 megawatts (MW), A run-of-the-river (RoR) project

Dams on Brahmaputra River in India

Dam / Project	River / Tributary	State	Notes
Subansiri Lower Hydroelectric Project	Subansiri	Arunachal Pradesh/Assam	India’s largest hydropower project in the basin (~2000 MW)
Upper Subansiri Project	Subansiri	Arunachal Pradesh	NHPC project
Ranganadi Dam	Ranganadi	Arunachal Pradesh	Tributary hydropower project
Doyang Dam	Doyang	Nagaland	Hydropower dam
Karbi Langpi Dam	Borpani	Assam	Hydropower project
Khandong Dam	Kopili	Meghalaya	Part of Kopili HE project
Umiam Dam	Umiam	Meghalaya	Hydroelectric + water supply
Nongkhyllem Dam	Umtru	Meghalaya	Hydropower dam
Rangit III Dam	Rangit	Sikkim	Hydropower dam
Rangpo Dam	Rongpo	Sikkim	Hydropower dam
Rongli Dam	Rongli	Sikkim	Hydropower dam
Jaldhaka HE Project	Jaldhaka	India/Bhutan	Shared project

Dams on Brahmaputra River in Bhutan

Dam / Project	River / Location	Notes
Chukha Hydropower Project	Wangchhu River (also known as the Raidāk River in India)	Major Bhutan hydropower station, 336MW hydro power project, run-of-the-river reservoir-based project
Tala Hydroelectric Project	Wangchu River	1,020 MW hydropower station in Bhutan’s Chukha District
Kurichhu Hydropower Project	Kurichhu River, a tributary of the Manas River system	A run-of-the-river project, meaning it uses the natural flow of the river
Daguchu Hydropower Project	Dagachhu River, a tributary of the Sunkosh River	Run-of-river hydropower plant, 126 MW (2 units of 63 MW each)

Cities on the Banks of Brahmaputra River

Several important cities and towns are situated along the banks of the Brahmaputra River, both in India and Bangladesh. In India, major urban centers include Guwahati, Dibrugarh, Tezpur, Jorhat, and Dhubri in Assam, while in Bangladesh, towns like Sirajganj, Tangail, and Chandpur lie along the lower course of the river. These cities are centers of trade, culture, agriculture, and river transport, but are also prone to seasonal flooding due to the river’s high discharge and sediment load.

City / Town	State / Country	Location / Notes
Pasighat	Arunachal Pradesh, India	One of the first major towns as the river enters India; in the Siang Valley
Dibrugarh	Assam, India	Major tea-growing region; on the right bank of the Brahmaputra
Tezpur	Assam, India	Cultural and historical city; near Kameng tributary confluence
Guwahati	Assam, India	Largest city in Assam; major urban center on the south bank; economic hub
Majuli	Assam, India	River island; known for culture and Vaishnavite monasteries (satras)
Jorhat	Assam, India	Important city in Upper Assam; near tributaries like Desang & Dikhow
Goalpara	Assam, India	On the Brahmaputra floodplain; close to Dhodnoi tributary
Dhubri	Assam, India	Western Assam; near Sankosh tributary; historical trade center
Noakhali / Mymensingh / Bogura	Bangladesh	Lower course of Brahmaputra (Jamuna); fertile agricultural plains
Sirajganj	Bangladesh	Major river town; flood-prone area; Jamuna-Padma confluence nearby
Tangail	Bangladesh	Jamuna flows past this town before merging with Padma
Bajitpur / Chandpur	Bangladesh	Lower reaches; near Meghna delta; river splits and joins Padma

Facts About Brahmaputra River

• The Brahmaputra is one of the largest rivers in Asia.
• Flows through three countries — Tibet (China), India, and Bangladesh — making it a trans-boundary river.
• Total length is approximately 2,900 km (Tibet: 1,700 km; India: 916 km; Bangladesh: 375 km).
• Its drainage basin covers about 580,000 sq km across China, India, and Bangladesh.
• It originates from the Angsi Glacier near Mount Kailash in Tibet at an altitude of ~5,300 meters.
• It has several regional names:
  • Tibet: Yarlung Tsangpo
  • Arunachal Pradesh: Siang / Dihang
  • Assam: Brahmaputra
  • Bangladesh: Jamuna, which joins the Padma (Ganges) to form the Meghna.
• The river flows eastward across Tibet, then makes a U-turn near Namcha Barwa, forming one of the deepest gorges in the world.
• It is joined by the Dibang and Lohit rivers in Arunachal Pradesh to become the Brahmaputra.
• Steep gradients and high discharge make it suitable for hydroelectric projects in Arunachal Pradesh.
• In Assam, the river forms wide braided channels, river islands, and sandbars (chars).
• Major left-bank tributaries include Lohit, Dibang, Kameng, Dhansiri (South), Burhi Dihing, Kopili, Kolong, Desang, Dikhow, Dhodnoi, Sankosh, Lhasa, Nyang, Parlung Zangbo.
• Major right-bank tributaries include Subansiri, Manas, Beki, Raidak, Jaldhaka, Teesta, Siyom, Sankosh (Torsa), Kameng (northern flow).
• The river is flood-prone, particularly during the monsoon season (June–September).
• Seasonal floods deposit fertile alluvium, supporting agriculture in Assam and Bangladesh.
• It flows into Bangladesh as the Jamuna, which later joins the Padma (Ganges) and becomes the Meghna before emptying into the Bay of Bengal.
• It contributes to one of the world’s largest delta systems with the Ganga and Meghna.
• Major cities on its banks include Pasighat, Dibrugarh, Tezpur, Guwahati, Majuli, Jorhat, Goalpara, Dhubri in India, and Sirajganj, Tangail, Chandpur in Bangladesh.
• It supports rice, jute, tea, and other crops, and provides inland water transport.
• Hydropower potential is high in Arunachal Pradesh due to steep gradients and heavy discharge.
• The river flow through the Kaziranga National Park, which is famous for one-horned rhinoceros, elephants, tigers, and migratory birds.
• Many tributaries carry glacial meltwater and sediments from the Himalayas, Patkai, and Meghalaya hills.
• Majuli, a river island in Assam, is one of the largest river islands in the world.
• The Brahmaputra forms dynamic channels that frequently change course due to sediment deposition and floods.

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