PrepYodhaClass Notes · Geography
Geography · India · 16

The Brahmaputra River System

The Brahmaputra is one of the mightiest trans-boundary rivers in the world, flowing through China (Tibet), India, and Bangladesh before draining into the Bay of Bengal. Originating in the glaciers of Tibet, it cuts through the Great Himalayas via a spectacular gorge and brings life to the plains of Assam. Known for its wide, braided channel and devastating annual floods, the Brahmaputra is also home to Majuli — the world's largest river island — and the remarkable Namcha Barwa gorge, the deepest in the world.

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Topic 01

Overview of the Brahmaputra

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The Brahmaputra is a trans-boundary river flowing across Tibet, northeast India, and Bangladesh.

Key Point
The Brahmaputra is one of the mightiest rivers of Asia; a trans-boundary river passing through China, India, and Bangladesh
  • Total length: 3,080 km (as per NCERT: 2,980 km)
  • Old Sanskrit name: Lawitya
  • 9th largest river in the world by discharge
  • 15th longest river in the world
  • Called the "Sorrow of Assam" because of its devastating annual floods
  • Flows through diverse physical regions — Himalayas, Plains, and Plateaus
  • Kanchanjunga (3rd highest point in the world) is the highest peak within the Brahmaputra Basin
📝 Quick self-test 2 MCQs · 2 fill-ups

By what nickname is the Brahmaputra known because of its devastating annual floods?

  1. Sorrow of Bihar
  2. Sorrow of Assam
  3. Sorrow of Bengal
  4. Sorrow of India
B. Sorrow of Assam — The Brahmaputra is called the 'Sorrow of Assam' due to its devastating annual floods.

The Brahmaputra is a trans-boundary river passing through which three countries?

  1. China, India, Nepal
  2. India, Bangladesh, Myanmar
  3. China, India, Bangladesh
  4. China, Nepal, Bangladesh
C. China, India, Bangladesh — The Brahmaputra passes through China, India, and Bangladesh.

The old Sanskrit name of the Brahmaputra is .

✔ Lawitya

The highest peak within the Brahmaputra Basin is , the 3rd highest point in the world.

✔ Kanchanjunga
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Topic 02

Source and Origin

The exact source of the Brahmaputra has been debated between two glaciers in Tibet.

Key Point
Traditional origin: Chemayungdung Glacier (also written Chema-yungdung) in Tibet, east of Kailash Range, east of Lake Mansarovar
  • New/revised opinion: Angsi Glacier in Tibet, southeast of Mount Kailash and Lake Mansarovar
  • Both source glaciers lie on the Tibetan Plateau, which is known as the "Roof of the World"
  • In China (Tibet), the river is known as Yarlung Tsangpo (or simply Tsangpo)
  • The Tibetan Plateau stage of the river runs roughly parallel to the Himalayas for 1,200 km
📝 Quick self-test 2 MCQs · 2 fill-ups

What is the traditional origin of the Brahmaputra?

  1. Angsi Glacier
  2. Chemayungdung Glacier
  3. Gangotri Glacier
  4. Siachen Glacier
B. Chemayungdung Glacier — The traditional origin is the Chemayungdung Glacier in Tibet.

In China (Tibet), the Brahmaputra is known by what name?

  1. Jamuna
  2. Siang
  3. Yarlung Tsangpo
  4. Padma
C. Yarlung Tsangpo — In Tibet the river is known as Yarlung Tsangpo (or simply Tsangpo).

The new/revised opinion states the Brahmaputra originates from the in Tibet.

✔ Angsi Glacier

The Tibetan Plateau, where the source glaciers lie, is known as the of the World.

✔ Roof
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Topic 03

Names in Different Regions and Countries

The Brahmaputra is known by different names as it flows through different countries and regions.

Key Point
The river is called Tsangpo in Tibet (China), Siang/Dihang in Arunachal Pradesh, Brahmaputra in Assam (India), and Jamuna in Bangladesh
Region / CountryLocal Name of the River
Tibet (China)Yarlung Tsangpo (Tsangpo)
Arunachal Pradesh — entering India (hills)Siang (also called Dihang)
Assam plains (after joining Dibang & Lohit)Brahmaputra
BangladeshJamuna
Joins Ganga (called Padma) and Meghna in BangladeshDrains into Bay of Bengal via Meghna
Course of the Brahmaputra
1
Yarlung Tsangpo (Tibet — 1,200 km parallel to Himalayas)
Turns south near Namcha Barwa — cuts a deep gorge through the Himalayas
2
Siang / Dihang (Arunachal Pradesh — enters India at Bichung)
Flows south through the Himalayan foothills
3
Brahmaputra (Assam plains — joins Dibang & Lohit near Sadiya Town)
Broad braided channel; world's largest river island Majuli
4
Jamuna (Bangladesh — joins Ganga/Padma)
Merges with Meghna → Bay of Bengal
📝 Quick self-test 2 MCQs · 2 fill-ups

What is the Brahmaputra called in Bangladesh?

  1. Padma
  2. Jamuna
  3. Meghna
  4. Siang
B. Jamuna — In Bangladesh the Brahmaputra is called the Jamuna.

In Arunachal Pradesh, the Brahmaputra is known as:

  1. Siang/Dihang
  2. Tsangpo
  3. Jamuna
  4. Lohit
A. Siang/Dihang — In Arunachal Pradesh it is called Siang, also called Dihang.

In Assam (India), the river is called the .

✔ Brahmaputra

The Brahmaputra finally drains into the Bay of Bengal via the river.

✔ Meghna
🇮🇳
Topic 04

Entry into India and its Course

The Brahmaputra cuts through the Himalayas via the world's deepest gorge before entering the plains of Assam.

Key Point
The Brahmaputra enters India through Arunachal Pradesh, known as the Siang River in the hill section
  • It runs parallel to the Himalayas for 1,200 km in Tibet, then turns south creating a deep gorge near Namcha Barwa (Yarlung Tsangpo Grand Canyon — deepest gorge in the world)
  • Enters India at Bichung (Arunachal Pradesh) — known as Dihang on the plains of Arunachal
  • Flows about 55 km southward and is joined by the Dibang River and Lohit River near Sadiya Town at the Head of the Assam Valley
  • The combined river officially becomes the Brahmaputra in Assam
Key formula from notes:

Siang + Dibang + Lohit = Brahmaputra

  • In Assam, the Brahmaputra has a wide, braided channel — one of the world's largest braided rivers
  • In Bangladesh, the river is called the Jamuna; it joins the Padma (Ganga) and then Meghna before draining into the Bay of Bengal
📝 Quick self-test 2 MCQs · 2 fill-ups

Through which state does the Brahmaputra enter India?

  1. Assam
  2. Sikkim
  3. Arunachal Pradesh
  4. West Bengal
C. Arunachal Pradesh — The Brahmaputra enters India through Arunachal Pradesh.

The deepest gorge in the world, formed by the Brahmaputra, is located near:

  1. Sadiya
  2. Namcha Barwa
  3. Bichung
  4. Majuli
B. Namcha Barwa — The Yarlung Tsangpo Grand Canyon near Namcha Barwa is the deepest gorge in the world.

The formula from the notes states: Siang + Dibang + Lohit = .

✔ Brahmaputra

The Brahmaputra has a wide, channel in Assam, one of the world's largest.

✔ braided
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Topic 05

Left-Bank Tributaries

Left-bank tributaries join the Brahmaputra from the north — they originate from the Eastern Himalayas and the hills of Arunachal Pradesh.

Key Point
Dibang is the most prominent left-bank tributary and one of the three rivers that form the Brahmaputra near Sadiya
#Left-Bank TributaryKey Notes
1DibangOriginates in Dibang valley district, Arunachal Pradesh; major left-bank tributary; flows through Arunachal Pradesh and Assam; joins near Sadiya Town (Tinsukia district, Assam)
2LohitRises in East Tibet; joins Brahmaputra at Sadiya, Arunachal Pradesh; Lohit means "The Red River" in local language
3Dihing / Burhi DihingFlows through Assam coalfields region
4DikhowLeft-bank tributary of Assam plains
5DhansiriJoins from the south-east; also listed under left-bank in some sources
6KopiliFlows through Meghalaya and Assam
Dibang River — Key Facts
  • Origin: Dibang valley district of Arunachal Pradesh
  • One of the 3 tributaries that together form the Brahmaputra (along with Siang/Dihang and Lohit)
  • Flows through Arunachal Pradesh and Assam; joins the Dihang River near Sadiya Town
  • Sadiya Town is located in Tinsukia district (Assam)
Lohit River — Key Facts
  • Origin: East Tibet region
  • Joins the Brahmaputra at Sadiya Town, Arunachal Pradesh
  • Lohit means "The Red River" in local language
📝 Quick self-test 2 MCQs · 2 fill-ups

Which is the most prominent left-bank tributary of the Brahmaputra?

  1. Subansiri
  2. Dibang
  3. Manas
  4. Teesta
B. Dibang — Dibang is the most prominent left-bank tributary and one of the three forming rivers.

What does the name 'Lohit' mean in the local language?

  1. The Blue River
  2. The Red River
  3. The Great River
  4. The Holy River
B. The Red River — Lohit means 'The Red River' in the local language.

The Dibang River originates in the district of Arunachal Pradesh.

✔ Dibang valley

The Lohit River rises in before joining the Brahmaputra at Sadiya.

✔ East Tibet
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Topic 06

Right-Bank Tributaries

Right-bank tributaries join the Brahmaputra from the south — they originate from the Eastern Himalayas and are important for drainage, irrigation, and hydroelectric power.

Key Point
The right-bank tributaries originate from the Eastern Himalayas and are critical for irrigation and hydroelectric power in the Northeast
#Right-Bank TributaryKey Notes
1SubansiriOriginates in Tibet; one of the larger right-bank tributaries of Brahmaputra
2KamengAlso known as Jiabharali; originates in Arunachal Pradesh
3BarnadiFlows through Assam
4ManasFlows through Bhutan and Assam; a UNESCO World Heritage Site; joins near Barpeta
5SankoshForms border between Assam and West Bengal; drains Bhutan
6TeestaOriginates in Sikkim; a major tributary; joins Brahmaputra in Bangladesh

Note on Teesta: The Teesta River is sometimes classified differently depending on whether India or Bangladesh is the reference point. In the page notes it appears under right-bank tributaries. It originates in Sikkim and eventually joins the Brahmaputra system in Bangladesh.

📝 Quick self-test 2 MCQs · 2 fill-ups

Which right-bank tributary of the Brahmaputra is a UNESCO World Heritage Site?

  1. Subansiri
  2. Kameng
  3. Manas
  4. Sankosh
C. Manas — The Manas flows through Bhutan and Assam and is a UNESCO World Heritage Site.

Which right-bank tributary originates in Sikkim?

  1. Teesta
  2. Barnadi
  3. Kameng
  4. Subansiri
A. Teesta — The Teesta originates in Sikkim and joins the Brahmaputra system in Bangladesh.

The right-bank tributaries of the Brahmaputra originate from the Himalayas.

✔ Eastern

The Kameng tributary is also known as .

✔ Jiabharali
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Topic 07

Majuli Island and Special Features

The Brahmaputra is home to one of the world's most remarkable geographical features — Majuli Island.

Key Point
Majuli is the largest river island in the world, located in the Brahmaputra River in Assam
  • Majuli is a unique river island formed by the Brahmaputra; it is a UNESCO-nominated site and a centre of Vaishnavite culture
  • The Brahmaputra has one of the world's largest braided channel systems in Assam
  • Kanchanjunga (8,598 m) — the 3rd highest point in the world and the highest peak within the Brahmaputra Basin
  • The Namcha Barwa Gorge (Yarlung Tsangpo Grand Canyon) near the bend where the river turns south is the deepest gorge in the world
  • The river is prone to severe annual flooding in Assam — hence the name "Sorrow of Assam"
  • The Brahmaputra flows through diverse physical regions: Himalayas → Northern Plains → Bangladesh delta
📝 Quick self-test 2 MCQs · 2 fill-ups

Majuli, located in the Brahmaputra, is the world's largest:

  1. Delta
  2. River island
  3. Lake
  4. Wetland
B. River island — Majuli is the largest river island in the world, located in Assam.

The Namcha Barwa Gorge on the Brahmaputra is the world's:

  1. Longest gorge
  2. Widest gorge
  3. Deepest gorge
  4. Highest gorge
C. Deepest gorge — The Namcha Barwa Gorge (Yarlung Tsangpo Grand Canyon) is the deepest gorge in the world.

Majuli Island is located in the Brahmaputra River in the state of .

✔ Assam

The Brahmaputra flows through diverse physical regions: Himalayas, Northern Plains, and the Bangladesh .

✔ delta
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Recap

Quick Revision

  • The Brahmaputra is 3,080 km long (NCERT: 2,980 km); 9th largest by discharge; 15th longest in the world
  • Old Sanskrit name of Brahmaputra: Lawitya
  • Traditional source: Chemayungdung Glacier, Tibet; new opinion: Angsi Glacier, Tibet
  • In Tibet (China), the river is called Yarlung Tsangpo (Tsangpo)
  • Enters India through Arunachal Pradesh — called Siang (hills) and Dihang (plains)
  • Siang + Dibang + Lohit = Brahmaputra (join near Sadiya Town)
  • In Bangladesh, the river is called Jamuna; merges with Padma → Meghna → Bay of Bengal
  • Left-bank tributaries: Dibang, Lohit, Dihing/Burhi Dihing, Dikhow, Dhansiri, Kopili
  • Right-bank tributaries: Subansiri, Kameng, Barnadi, Manas, Sankosh, Teesta
  • Majuli Island (Assam) = largest river island in the world (in Brahmaputra)
  • Brahmaputra is called the "Sorrow of Assam" due to recurrent floods
  • Lohit means "The Red River"; Dibang originates in Dibang valley, Arunachal Pradesh
  • Kanchanjunga is the highest peak within the Brahmaputra Basin

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