GeographyCBSE Class 11 · Drainage System

Major River Systems of India and Use of River Water (Class 11 Geography, India: Physical Environment, Chapter 3)

Updated 17 October 2026 · Fact-checked

The Indus, Ganga and Brahmaputra are the great Himalayan systems; the Godavari is the largest Peninsular system, and the Narmada and Tapi flow west through rift valleys. River water is uneven in time and space, so floods and drought coexist; pollution, silt, disputes and shrinking channels limit its use.

Understand Major River Systems: Indus, Ganga, Brahmaputra, Peninsular Rivers and Use of River Water

Why this topic matters. Source, tributary and length facts for the major rivers, and the problems of river water, are routine 1-5 mark items and map work.

1. Indus. Source: a glacier near Bokhar Chu in the Kailash range, Tibet, at 4,164 m (Singi Khamban). Length 2,880 km, of which 1,114 km is in India; basin 11,65,000 sq km, of which 321,289 sq km is in India. It flows north-west between the Ladakh and Zaskar ranges, forms a gorge near Gilgit and enters Pakistan near Chilas. At Attock it receives the Kabul on the right. The Jhelum rises at Verinag, the Chenab (largest tributary) is formed where the Chandra and Bhaga meet at Tandi, the Ravi rises near the Rohtang pass, the Beas near Beas Kund, and the Satluj from Raksas tal. The Panjnad joins above Mithankot and the Indus enters the Arabian Sea east of Karachi.

2. Ganga. Rises in the Gangotri glacier near Gaumukh (3,900 m) as the Bhagirathi. At Devprayag the Bhagirathi meets the Alaknanda and the river is called the Ganga. It enters the plains at Haridwar.

3. Brahmaputra. Source: the Chemayungdung glacier near Mansarovar. It flows about 1,200 km east in southern Tibet as the Tsangpo, cuts a deep gorge near Namcha Barwa (7,755 m), enters India west of Sadiya as the Siang or Dihang, and is joined by the Dibang and Lohit. It flows 750 km in the Assam valley, enters Bangladesh near Dhubri, is joined by the Tista, and is called the Jamuna. It is known for floods, channel shifting and bank erosion.

4. Peninsular rivers. Mahanadi: 851 km, from Chhattisgarh through Odisha. Godavari (Dakshin Ganga): 1,465 km, largest Peninsular system, from Nasik district, with tributaries Penganga, Indravati, Pranhita and Manjra. Krishna: 1,401 km, from near Mahabaleshwar, tributaries Koyna, Tungabhadra and Bhima. Kaveri: 800 km, from the Brahmagiri hills, flows all year with less fluctuation because the upper basin gets summer rain and the lower basin gets winter rain. Narmada: 1,312 km, from Amarkantak, in a rift valley between the Satpura and Vindhyan ranges, with the Dhuandhar falls near Jabalpur. Tapi: 724 km, from Multai in Betul district. Luni: the largest river system of Rajasthan, ephemeral, ends in the Rann of Kachchh.

5. Use of river water. Water is available unevenly in time and space; floods occur in one place and drought in another. Inter-basin linkage aims to move surplus to deficit areas. Problems: insufficient quantity, pollution, silt load, uneven seasonal flow, inter-state disputes and shrinking channels. Pollution comes from sewage, industrial effluents, rituals and bathing; schemes include the Ganga Action Plan and Namami Gange.

Major River Systems: Indus, Ganga, Brahmaputra, Peninsular Rivers and Use of River Water: key facts

Indus: Length 2,880 km (India 1,114 km)
Source near Bokhar Chu, 4,164 m
Largest tributary Chenab
Enters Arabian Sea east of Karachi; Westernmost Himalayan river.
Ganga: Gangotri glacier, Gaumukh 3,900 m
Bhagirathi + Alaknanda at Devprayag
Enters plains at Haridwar; Ganga begins at Devprayag.
Brahmaputra: Tsangpo in Tibet about 1,200 km
Gorge near Namcha Barwa 7,755 m
Siang or Dihang
Assam valley 750 km
Jamuna in Bangladesh; Large floods and bank erosion.
Peninsular lengths: $G o d a v a r i 1, 465 k m ∣ K r i s hna 1, 401 k m ∣ N a r ma d a 1, 312 k m ∣ M ahana d i 851 k m ∣ K a v er i 800 k m ∣ T a p i 724 k m$; Godavari is the largest system.

How to answer Major River Systems: Indus, Ganga, Brahmaputra, Peninsular Rivers and Use of River Water questions

River facts are best given as source, course, tributaries and mouth.

1Name the source place and its height if given.
2Trace the main stretch with the key place names.
3List 2 or 3 main tributaries.
4State where it ends and one distinctive feature.

Major River Systems: Indus, Ganga, Brahmaputra, Peninsular Rivers and Use of River Water in real life

The idea, met in an everyday situation. Answer the question in your own words, then compare with the model answer. The one-line hook is what to remember.

Flood here, drought there

Suppose in one monsoon month a river basin floods in its lower part while an upland district nearby faces a water shortage.

Which problem of river water is this?

Try it first, then show the solutionSolution

Water is uneven in time and space.
Inter-basin or better management is needed.

Answer: Uneven availability of river water, a management issue.

Memory hook: Too much here, too little there.

Clean river campaign

Suppose a town drains its sewage and factory waste untreated into the river that flows past it.

Which problem of river water use is shown and which scheme addresses it for the Ganga?

Try it first, then show the solutionSolution

Sewage and effluents pollute the water.
The Ganga Action Plan and Namami Gange are cleaning schemes.

Answer: River water pollution; Namami Gange.

Memory hook: Pollution needs plans.

Tricks to remember Major River Systems: Indus, Ganga, Brahmaputra, Peninsular Rivers and Use of River Water

Short memory aids. Say each one aloud once, then use it on a question the same day.

Bhagirathi + Alaknanda
Meet at Devprayag to form the Ganga
Use it when: Ganga source.
Tsangpo to Jamuna
Tibet Tsangpo, India Siang then Brahmaputra, Bangladesh Jamuna
Use it when: Names of the river.
Godavari tops
Godavari 1,465 km is the longest Peninsular river
Use it when: Peninsular ranking.

Major River Systems: Indus, Ganga, Brahmaputra, Peninsular Rivers and Use of River Water: solved examples

Ordered from board level to HOTS. Try each one before you open the solution.

Example 1: Devprayag · 1 mark · MCQBoard level

The Ganga is formed at Devprayag by the meeting of the Bhagirathi and the:
(A) Yamuna
(B) Alaknanda
(C) Mandakini
(D) Pindar

Try it first, then show the solutionSolution

The Bhagirathi meets the Alaknanda at Devprayag (1 mark).

Answer: (B)

Example 2: Chenab · 2 marks · Very short answerBoard level

Why is the Chenab called Chandrabhaga and what is special about it among Indus tributaries? (2 marks)

Try it first, then show the solutionSolution

Formed by the Chandra and Bhaga meeting at Tandi (1 mark).
It is the largest tributary of the Indus (1 mark).

Answer: The Chandra and the Bhaga meet at Tandi near Keylong, hence the name Chandrabhaga. The Chenab is the largest tributary of the Indus.

Example 3: Kaveri flow · 3 marks · Short answerHarder board level

The Kaveri shows little seasonal fluctuation, unlike most Peninsular rivers. Account for this. (3 marks)

Try it first, then show the solutionSolution

Upper catchment gets south-west monsoon rain in summer (1 mark).
Lower catchment gets north-east monsoon rain in winter (1 mark).
So flow fluctuates less across the year (1 mark).

Answer: The upper catchment of the Kaveri receives rain from the south-west monsoon in summer and the lower catchment from the north-east monsoon in winter, so it receives water in both seasons and flows throughout the year with less fluctuation.

Example 4: Assertion and reason: Brahmaputra · 1 mark · Assertion-reasonHarder board level

Assertion (A): Assam suffers repeated bank erosion and shifting of channels along the Brahmaputra.
Reason (R): The Brahmaputra and its large tributaries carry heavy sediment from a high-rainfall catchment.
(A) Both true, R explains A
(B) Both true, R does not explain A
(C) A true, R false
(D) A false, R true

Try it first, then show the solutionSolution

The chapter gives this as the reason for its floods and channel shifting (1 mark).

Answer: (A)

Example 5: HOTS: Indus length share · 5 marks · Long answerHOTS / competency

The Indus is 2,880 km long and 1,114 km of this lies in India. Calculate the share of its length in India and state in which Indian regions it flows. Then say what the figures suggest about the river. (5 marks)

Try it first, then show the solutionSolution

Share = 1,114 / 2,880 x 100 (1 mark).
= 38.7 per cent, about 39 per cent (1 mark).
It flows through Ladakh and Jammu and Kashmir (1 mark).
So well under half the length lies in India (1 mark).
Most of the course, including the Panjnad confluence and the delta, lies in Pakistan (1 mark).

Answer: The share of length in India is 1,114 / 2,880 x 100 = about 38.7 per cent. In India the Indus flows through Ladakh and Jammu and Kashmir. Less than half its length is in India, and the later course, including the Panjnad confluence above Mithankot and the mouth east of Karachi, is in Pakistan.

Where students lose marks in Major River Systems: Indus, Ganga, Brahmaputra, Peninsular Rivers and Use of River Water

The slips examiners see most often, and what to write instead.

Mistake: Giving the Ganga a source at Haridwar
Place confusion.
Wrong working
Ganga rises at Haridwar.
Right working
Ganga rises at Gangotri (Gaumukh) as the Bhagirathi; it enters the plains at Haridwar.
Do this: Separate source and plains entry.
Usually costs: 1 mark.
Mistake: Wrong Brahmaputra names
Names change by country.
Wrong working
Brahmaputra is called Tsangpo in India.
Right working
Tsangpo in Tibet, Siang or Dihang in Arunachal, Brahmaputra in Assam, Jamuna in Bangladesh.
Do this: Write the sequence.
Usually costs: 1 mark.
Mistake: Calling all Peninsular rivers west-flowing
Overgeneralisation.
Wrong working
Peninsular rivers flow to the Arabian Sea.
Right working
Most flow west to east to the Bay of Bengal; Narmada and Tapi are exceptions.
Do this: Remember the two exceptions.
Usually costs: 1 mark.

Exam tips

Use the order source, course, tributaries, mouth for every river answer.
Quote lengths and heights exactly as in the chapter.
For river water problems write six points in a ranked list.

Practice questions on Major River Systems: Indus, Ganga, Brahmaputra, Peninsular Rivers and Use of River Water

Write each answer on paper first. Open the hint only if you are stuck, and the answer only when you have finished.

Q1 · 1 mark · MCQBoard level
The largest Peninsular river system is the:
(A) Krishna
(B) Godavari
(C) Kaveri
(D) Mahanadi
Hint
Dakshin Ganga.
Answer
(B)
Q2 · 2 marks · Very short answerBoard level
Name the two Peninsular rivers that flow into the Arabian Sea through rift valleys. (2 marks)
Hint
Rift valleys.
Answer
The Narmada and the Tapi.
Q3 · 3 marks · Short answerHarder board level
Describe the course of the Brahmaputra from Tibet to the Bay of Bengal. (3 marks)
Hint
Tsangpo, Siang, Jamuna.
Answer
It rises near Mansarovar and flows east in southern Tibet as the Tsangpo, cuts a gorge near Namcha Barwa, and enters India as the Siang or Dihang west of Sadiya. After meeting the Dibang and Lohit it is the Brahmaputra and flows 750 km in Assam. It enters Bangladesh near Dhubri, where the Tista joins and it becomes the Jamuna, then merges with the Padma and reaches the Bay of Bengal.
Q4 · 3 marks · Short answerHarder board level
List four problems in using river water in India and suggest one remedy for pollution. (3 marks)
Hint
Quantity, silt, disputes.
Answer
Problems are insufficient quantity, river water pollution, silt load, uneven seasonal flow, inter-state disputes and shrinking channels. For pollution, schemes such as the Ganga Action Plan and Namami Gange aim to reduce sewage and effluent entering the river.
Q5 · 4 marks · Short answerHOTS / competency
Compare the Narmada with the Godavari in direction, valley type and deltaic deposits, giving the reason for the difference. (4 marks)
Hint
Rift valley.
Answer
The Narmada flows west to the Arabian Sea in a rift valley between the Satpura and Vindhyan ranges, whereas the Godavari flows east across the Peninsula to the Bay of Bengal and forms a large delta after Rajamundri. The Narmada lies in a trough fault and lacks alluvial and deltaic deposits; the tilt of the block towards the east oriented the Godavari towards the Bay of Bengal.

Test your recall

Answer in your head or on paper first, then open the card. Pulling an answer out of memory makes it stick far better than re-reading.

1.Where does the Satluj feed a canal system?Show answer
Bhakra Nangal.
2.What is the Tsangpo?Show answer
The Brahmaputra in Tibet.
3.Which is the largest Rajasthan river system?Show answer
The Luni.
4.What does Dakshin Ganga refer to?Show answer
The Godavari.

Major River Systems: Indus, Ganga, Brahmaputra, Peninsular Rivers and Use of River Water: frequently asked questions

Is the Yamuna dealt with in this topic?

Only the Ganga origin is covered here; its detailed tributaries are in the chapter page.

What is an antecedent river?

A river that keeps its course while the land rises across it, as in the Satluj and Subansiri.

Which river forms the Dhuandhar falls?

The Narmada near Jabalpur.