Master10
Indian Geography Module

Indian River Systems & Drainage Basins

India's drainage network is broadly bifurcated into the perennial Himalayan and the rain-fed Peninsular river systems, separated by the major water divide along the Delhi ridge, Aravallis, and Sahyadris. The Himalayan system encompasses three major basins: the Indus, the Ganga, and the Brahmaputra (Yarlung Tsangpo), characterized by large catchments, deep V-shaped gorges, and antecedent drainage patterns. In contrast, Peninsular rivers such as the Godavari (Dakshin Ganga), Krishna, Mahanadi, and Cauvery flow eastward into the Bay of Bengal, forming fertile deltas, while the Narmada and Tapi flow westward through tectonic rift valleys to empty into the Arabian Sea without delta formation, creating tidal estuaries.

Key Concepts & Examination Highlights

  • The Ganga is India's longest river within the country (2,525 km), originating at the confluence of the Bhagirathi and Alaknanda at Devprayag.
  • The Indus Waters Treaty of 1960 allocates the waters of the Ravi, Beas, and Sutlej to India, and Indus, Jhelum, and Chenab to Pakistan.
  • The Godavari is the longest Peninsular river (1,465 km), originating at Trimbakeshwar near Nashik in Maharashtra.
  • Majuli in Assam, situated on the Brahmaputra River, is the world's largest inhabited riverine island.
  • The Indus River originates near Lake Manasarovar from the Bokhar Chu glacier in the Tibetan Plateau and flows through Ladakh before entering Pakistan.
  • The Yamuna River, originating from the Yamunotri Glacier on the Banderpoonch peak, is the longest tributary of the Ganga and meets it at the Triveni Sangam in Prayagraj.
  • The Alaknanda River originates from the Satopanth Glacier and meets the Dhauliganga at Vishnuprayag, Nandakini at Nandaprayag, Pindar at Karnaprayag, and Mandakini at Rudraprayag.
  • The Brahmaputra River is known as the Tsangpo in Tibet, Dihang or Siang upon entering Arunachal Pradesh, and Jamuna after entering Bangladesh.
  • The Krishna River originates at Mahabaleshwar in Maharashtra and its major tributaries include the Tungabhadra, Bhima, Koyna, Ghataprabha, and Malaprabha.
  • The Kaveri (Cauvery) River originates at Talakaveri in the Brahmagiri Range of Karnataka and forms the Shivanasamudra and Hogenakkal waterfalls.
  • The Narmada River originates from the Amarkantak Plateau in Madhya Pradesh and flows through a rift valley between the Vindhya and Satpura ranges, creating the Dhuandhar Falls at Bhedaghat.
  • The Tapi (Tapti) River originates in the Multai reserve forest of Betul district in Madhya Pradesh and flows westward into the Gulf of Khambhat.
  • The Indus River originates from the Bokhar Chu glacier near Lake Manasarovar in Tibet and enters India in Ladakh between the Ladakh and Zanskar mountain ranges.
  • The Chenab, the largest tributary of the Indus in India, is formed by the confluence of two streams, the Chandra and the Bhaga, at Tandi in Lahaul-Spiti.
  • The Ganga originates as the Bhagirathi from the Gangotri Glacier at Gaumukh and officially becomes the Ganga after joining the Alaknanda at Devprayag.
  • The Alaknanda's five holy confluences (Panch Prayag) are Vishnuprayag (with Dhauliganga), Nandaprayag (with Nandakini), Karnaprayag (with Pindar), Rudraprayag (with Mandakini), and Devprayag (with Bhagirathi).
  • The Yamuna is the longest tributary of the Ganga, originating at the Yamunotri Glacier on the Banderpooch peak, joining the Ganga at Prayagraj (Triveni Sangam).
  • The Brahmaputra originates as the Yarlung Tsangpo from the Chemayungdung glacier in Tibet, enters Arunachal Pradesh as the Siang/Dihang, and joins the Ganga in Bangladesh to form the Meghna before emptying into the Bay of Bengal.
  • The Godavari, known as Dakshin Ganga or Vridha Ganga, is India's longest peninsular river (1,465 km), originating from Trimbakeshwar in the Nashik district of Maharashtra.
  • The Krishna River rises at Mahabaleshwar in Maharashtra and its major tributaries include the Koyna, Tungabhadra, Bhima, Ghataprabha, and Malaprabha.
  • The Cauvery River originates at Talakaveri in the Brahmagiri Range of Karnataka's Kodagu district and creates the famous Shivanasamudra and Hogenakkal waterfalls.
  • The Narmada and Tapti (Tapi) flow westward through tectonic rift valleys between the Vindhya and Satpura ranges, emptying into the Arabian Sea without forming deltas.
  • The Narmada originates from the Amarkantak Plateau in Madhya Pradesh and plunges over the marble rocks at Bhedaghat to form the Dhuandhar Falls.
  • The Mahanadi rises in the highlands of Raipur district in Chhattisgarh and flows through Odisha, hosting the Hirakud Dam, the longest earthen dam in India.
  • The Luni River is the largest inland river system in the Thar Desert of Rajasthan, originating in the Pushkar Valley of the Aravallis and disappearing into the Rann of Kutch.
  • Indian drainage systems are categorized into Himalayan and Peninsular river systems based on their origin, age, and flow regime.
  • Over 77 percent of the drainage area in India discharges into the Bay of Bengal, while about 23 percent drains into the Arabian Sea.
  • The Indus River originates near Lake Manasarovar from the Bokhar Chu glacier in the Tibetan plateau.
  • The five principal tributaries of the Indus in India are the Jhelum, Chenab, Ravi, Beas, and Sutlej, forming the Panjnad.
  • The Chenab is the largest tributary of the Indus, formed by the confluence of the Chandra and Bhaga streams at Tandi in Himachal Pradesh.
  • The Jhelum rises from the spring at Verinag at the foothill of the Pir Panjal range and flows through Wular Lake in Jammu and Kashmir.
  • The Sutlej originates from the Rakas Lake near Manasarovar in Tibet, where it is known as Langchen Khambab.
  • Under the Indus Waters Treaty of 1960, India has unrestricted rights over the waters of the eastern rivers (Ravi, Beas, Sutlej), while Pakistan receives the western rivers (Indus, Jhelum, Chenab).
  • The Ganga originates as the Bhagirathi from the Gangotri Glacier at Gaumukh in Uttarkashi district of Uttarakhand.
  • The Bhagirathi joins the Alaknanda at Devprayag to officially form the Ganga River.
  • The Alaknanda originates from the Satopanth and Bhagirath Kharak glaciers above Badrinath.
  • Panch Prayag represents five sacred river confluences: Vishnuprayag (Alaknanda-Dhauliganga), Nandaprayag (Alaknanda-Nandakini), Karnaprayag (Alaknanda-Pindar), Rudraprayag (Alaknanda-Mandakini), and Devprayag (Alaknanda-Bhagirathi).
  • The Ganga flows over a total length of 2,525 kilometers across Uttarakhand, Uttar Pradesh, Bihar, and West Bengal before entering Bangladesh as the Padma.
  • The Yamuna is the longest tributary of the Ganga, originating from the Yamunotri Glacier on the Banderpunch range.
  • The Yamuna merges with the Ganga at the holy Sangam in Prayagraj, receiving tributaries like the Chambal, Sind, Betwa, and Ken on its right bank.
  • The Ghaghara, Gandak, Kosi, and Ramganga are major left-bank tributaries originating in the Himalayas that feed the Ganga.
  • The Kosi River is known as the 'Sorrow of Bihar' due to its frequent shifting course and severe annual flooding.
  • The Son River originates from the Amarkantak Plateau in Madhya Pradesh and is a major right-bank tributary joining the Ganga near Patna.
  • The Brahmaputra originates in Tibet from the Chemayungdung glacier, where it flows eastward as the Tsangpo.
  • The Tsangpo enters India in Arunachal Pradesh near Namcha Barwa as the Siang or Dihang River.
  • The Dihang is joined by the Dibang and Lohit rivers near Sadiya in Assam to formally become the Brahmaputra.
  • The Brahmaputra joins the Padma in Bangladesh to form the Meghna before emptying into the Bay of Bengal.
  • The combined delta of the Ganga and Brahmaputra forms the Sundarbans Delta, the largest delta and mangrove forest in the world.
  • The Narmada River originates from the Amarkantak Plateau in Madhya Pradesh and flows westward through a rift valley between the Vindhyan and Satpura ranges.
  • The Narmada creates the famous Dhuandhar Falls and Marble Rocks gorge near Jabalpur before entering the Gulf of Khambhat.
Curriculum & Reference Sources: NCERT Class XI India: Physical Environment, Central Water Commission (CWC), Ministry of Jal Shakti.

Sample Solved Questions & Concept Explanations

8 Verified Concept Questions
Q1.EASY

Which is the longest river flowing entirely within India?

Q2.EASY

Which river is known as the 'Dakshin Ganga' (Ganga of the South)?

Q3.EASY

The Majuli river island, the world's largest inhabited river island, is located on which river?

Q4.EASY

Which westward flowing river flows through a rift valley between the Vindhya and Satpura ranges?

Q5.EASY

The famous Jog Falls (Gerosoppa) in Karnataka is situated on which river?

Q6.MEDIUM

Wular Lake, one of the largest freshwater lakes in Asia, is situated in which state/UT?

Q7.MEDIUM

Which river forms the famous Dhuandhar Falls near Jabalpur in Madhya Pradesh?

Q8.MEDIUM

Which is the largest natural saltwater coastal lagoon in India?