Maarg Manthan · Topic 15.5

Peninsular Drainage and East-Flowing Rivers

Geography › Drainage Systems of India · Topic 15.5

The peninsular rivers are older than the Himalayan rivers, rain-fed and seasonal, with broad shallow valleys, mature courses and low sediment loads. The major east-flowing rivers, the Mahanadi, Godavari, Krishna and Kaveri, rise in or near the Western Ghats, cross the plateau and build deltas on the east coast. Their water is the subject of disputes between states and of river-linking proposals.

6 min read · UPSC Prelims · Geography · Drainage Systems of India

At a Glance

Character Seasonal, rain-fed, mature
Godavari About 1,465 km; Dakshin Ganga
Krishna About 1,400 km; Bhima and Tungabhadra
Kaveri About 800 km; Talakaveri
Mahanadi About 851 km; Hirakud
Exam link UPSC Prelims, Geography: Drainage Systems of India

Where Does It Fit?

This is the fifth topic of the macro on the drainage systems of India. The previous topic described the Brahmaputra, and this one covers the large east-flowing rivers of the Peninsula. The last topic of the macro covers the west-flowing rivers. Previous topic: Brahmaputra River System. Next topic: West-Flowing Peninsular Rivers.

How Do Peninsular Rivers Differ From Himalayan Rivers?

Feature	Himalayan rivers	Peninsular rivers
Source	Glaciers and the high Himalaya	Western Ghats and plateau hills
Flow	Perennial; snow-melt and rain	Seasonal; rain only, highest in the monsoon
Basin	Very large	Smaller
Valleys	Deep gorges; young, with vigorous erosion	Broad, shallow valleys; mature and close to base level
Courses	Meanders and shifting channels in the plains	Mostly straight courses on hard rock
Drainage	Antecedent	Consequent; mostly concordant with the slope
Mouths	Big deltas	Deltas on the east coast; estuaries on the west
Use	Irrigation, navigation, hydropower	Irrigation through dams and storage; limited navigation

Each of the large rivers builds a river delta at its mouth. The Western Ghats form the main water divide, and the rivers flow east, as in Hill Ranges of the Peninsular Plateau. The origin of the pattern is explained by two ideas. The first is that the Sahyadri–Aravalli axis was once the central divide of a larger land mass, whose western half sank into the Arabian Sea during the Tertiary; the rift valleys of the Narmada and Tapti are the result. The second is that the faulting caused by the bending of the northern Peninsula at the time of the Himalayan upheaval tilted the block eastward. The first is considered more likely, as the straight west coast, the steep scarp of the Ghats and the absence of deltas on the west support it.

What Are the Main East-Flowing Rivers?

River	Source and length	Features
Mahanadi	Dhamtari area near Raipur in Chhattisgarh, about 442 m; about 851 km	Drains the Chhattisgarh plain; tributaries Seonath, Hasdeo, Mand and Ib on the left and Ong, Tel and Jonk on the right; the Hirakud Dam at Sambalpur forms one of the longest earthen dams; flows into the Bay of Bengal by several channels near Cuttack; floods the delta in some years; Bhilai, Korba and Hirakud industries
Godavari	Trimbakeshwar near Nashik, about 1,067 m; about 1,465 km	The longest peninsular river, called Dakshin Ganga; basin of about 3.1 lakh sq km across Maharashtra, Telangana, Andhra Pradesh, Chhattisgarh and Odisha; Manjra on the right; Penganga, Wardha, Wainganga, Pranahita, Indravati and Sabari on the left; splits below Rajahmundry into Gautami and Vashishta to make a lobate delta; Singareni coal in its basin; Polavaram multipurpose project
Krishna	Mahabaleshwar in the Western Ghats; about 1,400 km	Tributaries Bhima, Tungabhadra, Koyna, Ghataprabha, Malaprabha and Musi; forms a delta with the Godavari near Machilipatnam; Nagarjuna Sagar and Srisailam dams; basin shared by Maharashtra, Karnataka, Telangana and Andhra Pradesh, which have a long-running water dispute
Kaveri (Cauvery)	Talakaveri on the Brahmagiri range in Kodagu, about 1,341 m; about 800 km	Tributaries Hemavati, Kabini, Bhavani, Amaravati; Shivasamudram falls (about 101 m); Mettur Dam; Srirangam island; the Grand Anicut of the Chola period; its delta, the granary of the south, is fed by both monsoons; a dispute among Karnataka, Tamil Nadu, Kerala and Puducherry
Pennar	Chenna Kesava hill in Karnataka; about 597 km	Falls into the Bay of Bengal near Nellore; Somasila reservoir
Subarnarekha, Brahmani and Baitarani	Chotanagpur plateau	Smaller rivers of the north-east of the Peninsula, with Hirakud-linked industries and the Brahmani-Baitarani delta in Odisha
Vaigai and Ponnaiyar	Tamil Nadu hills	Short rivers of the south; the Vaigai flows past Madurai

What Are the Disputes and River-Linking Plans?

Cauvery dispute: a Supreme Court judgment of 2018 allocated about 404 TMC of water to Tamil Nadu and about 285 TMC to Karnataka, with smaller shares for Kerala and Puducherry, and the Cauvery Water Management Authority supervises the release. Karnataka’s Mekedatu dam proposal remains contested.
Krishna and Godavari: the Krishna Water Disputes Tribunal and the Godavari Water Disputes Tribunal have made awards, but the sharing among the states formed after the division of Andhra Pradesh is still in dispute. The Polavaram project is under construction.
Mahanadi: Odisha and Chhattisgarh dispute the use of water, and a tribunal was set up to examine it.
River linking: the interlinking of rivers programme, based on the National Perspective Plan of 1980 proposed a Himalayan and a Peninsular component. The Ken–Betwa link, whose foundation stone was laid in December 2024, is the first project. The Godavari–Cauvery link is also being studied to carry water from surplus basins to deficit ones, as in Classification of Drainage Systems of India.

As an analytical point, the Peninsular rivers are the most heavily regulated in the country; the Cauvery, Krishna and Godavari are almost fully used, so the struggles over their water are as much about the allocation among states as about shortage, and the effect of climate change on the monsoon will make rules for years of deficit as important as the rules for normal years.

Why Is This Topic Important?

Facts Sources and lengths asked
Disputes Cauvery and Krishna
Policy River-linking

What Came Next?

The last topic of the macro describes the west-flowing peninsular rivers. Next topic: West-Flowing Peninsular Rivers.

Key People and Terms

Dakshin Ganga Godavari, the Ganga of the south
Concordant drainage Drainage following the slope or structure
Lobate delta Rounded delta with many distributaries
Grand Anicut Ancient Cauvery weir
TMC Thousand million cubic feet
Link canal Channel moving water between basins

Exam Corner

Points to Remember

The Godavari is the longest peninsular river.
The Godavari rises at Trimbakeshwar.
The Cauvery rises at Talakaveri.
The Krishna rises near Mahabaleshwar.
Hirakud is on the Mahanadi.

Do Not Confuse With

Godavari and Krishna Dakshin Ganga versus the river with Bhima and Tungabhadra
Hirakud and Nagarjuna Sagar Mahanadi versus Krishna
Gautami and Vashishta The two Godavari delta branches

Memory Hook

Mahanadi to Hirakud, Godavari to Trimbak, Krishna from Mahabaleshwar, Kaveri from Talakaveri.

Mains Angle

Questions compare the Peninsular rivers and ask about disputes. These points add depth.

Nature Seasonal and mature
Use Intensive regulation
Conflict Interstate sharing

A Question You May Face

An original practice question, not a past paper question.

“Describe the major east-flowing rivers of the Peninsula and discuss the interstate water disputes related to them.”

How to Answer

Features Peninsular versus Himalayan.
Rivers Mahanadi to Kaveri.
Disputes Cauvery and Krishna.
Solutions Tribunals and linking.

GS Relevance

Prelims: source, length, tributaries, dams, deltas of each river; comparison with Himalayan rivers; interstate disputes. GS Paper 1: drainage; GS Paper 3: irrigation, river-linking.

Frequently Asked Questions

Why do most peninsular rivers flow east?

Most peninsular rivers flow east because the Peninsular Plateau slopes from west to east, and the Western Ghats form the main water divide. The rivers rise in or near the Ghats, cross the plateau and fall into the Bay of Bengal, building deltas at their mouths.

Which is the longest peninsular river?

The Godavari is the longest and largest river of peninsular India, with a length of about 1,465 kilometres and a basin of about 3.1 lakh square kilometres. It rises at Trimbakeshwar near Nashik and is called the Dakshin Ganga, or the Ganga of the south.

What are the major tributaries of the Krishna?

The Krishna rises near Mahabaleshwar and flows for about 1,400 kilometres. Its major tributaries are the Bhima and the Tungabhadra, and others include the Koyna, Ghataprabha, Malaprabha and Musi. Its delta merges with that of the Godavari near the coast of Andhra Pradesh.

What is the Cauvery water dispute?

The Cauvery dispute is a long-running conflict between Karnataka and Tamil Nadu, with Kerala and Puducherry also involved, over the sharing of the river water. The Supreme Court in 2018 gave Tamil Nadu about 404 TMC and Karnataka about 285 TMC, and the Cauvery Water Management Authority monitors water release.

What is the Ken–Betwa link project?

The Ken–Betwa link project is the first project under India's river-linking programme, which will transfer water from the Ken river in Madhya Pradesh to the Betwa river for irrigation in the Bundelkhand region. Its foundation stone was laid in December 2024, and it is also known for concerns about the Panna tiger reserve.

PYQ Practice — Statement Analysis

1 The Godavari is the longest river of peninsular India.

True

It is called Dakshin Ganga.

2 The Hirakud Dam is built on the Krishna river.

False

It is on the Mahanadi.

3 Peninsular rivers are mostly perennial and fed by glaciers.