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Quick recap: the drainage of India on one page

Drainage of India · Quick recap · Fact-checked on 8 November 2026 · how we check

Written with AI from the sources listed at the bottom of this page, then fact-checked by a separate AI.

All four parts condensed for quick revision: drainage patterns and the Indus; the Ganga and Brahmaputra; the peninsular rivers; and lakes and the management of river water.

India's rivers form two families. Every river drains a drainage basin, and basins are separated by a water divide: the Indus and Ganga systems part on a barely raised strip of plain near Ambala, and in the Peninsula the Western Ghats are the main divide. The Ganga basin is the largest in India. Himalayan rivers are fed by snow and rain, so they flow all year, cut deep gorges and build large deltas; the Indus, Satluj and Brahmaputra are antecedent, older than the mountains they cross. Peninsular rivers are fed by rain alone, flow in old, graded valleys and seldom change course. Drainage patterns reflect the rock below: dendritic on uniform rock, trellis on folded rock, radial outward from Amarkantak and centripetal inward to Loktak.

Part 1, the Indus system: the Indus rises in Tibet near Mansarovar, flows through Ladakh between the Ladakh and Zaskar ranges, cuts a gorge near Nanga Parbat and enters Pakistan. Its Punjab tributaries are the Jhelum (from Verinag, through Srinagar and Wular), the Chenab (formed by the Chandra and Bhaga at Tandi, the largest tributary), the Ravi, the Beas (the only one wholly in India, joining the Satluj at Harike) and the Satluj (from near Rakas Tal, entering India at Shipki La, dammed at Bhakra). Under the Indus Waters Treaty of 1960, signed at Karachi with the World Bank's help, the eastern rivers (Ravi, Beas, Satluj) went to India and the western rivers (Indus, Jhelum, Chenab) to Pakistan. India held the treaty in abeyance in April 2025.

Part 2, the Ganga and Brahmaputra: the Bhagirathi (from Gaumukh at the Gangotri glacier) and the Alaknanda meet at Devprayag to form the Ganga, the Alaknanda having passed Vishnuprayag, Nandprayag, Karnaprayag and Rudraprayag on the way. The Ganga flows past Haridwar, Kanpur, Prayagraj (where the Yamuna joins), Varanasi and Patna to the Farakka barrage and on into Bangladesh as the Padma. Left-bank tributaries include the Ramganga, Gomti, Ghaghara, Gandak and Kosi; right-bank ones include the Yamuna (with the Chambal, Betwa and Ken), the Son and the Damodar. The Brahmaputra rises as the Tsangpo in Tibet, turns at the Great Bend near Namcha Barwa, enters Arunachal Pradesh as the Siang, forms Majuli island in Assam and becomes the Jamuna in Bangladesh. The Ganga became the National River in 2008.

Part 3, the peninsular rivers: because the plateau tilts east, the Godavari (from Trimbakeshwar, the largest peninsular river), the Krishna (from near Mahabaleshwar, with the Tungabhadra and Bhima) and the Kaveri (from Talakaveri in Kodagu, fed by both monsoons) rise in the Western Ghats yet reach the Bay of Bengal and build deltas, as does the Mahanadi with the Hirakud dam. The Narmada (from Amarkantak, between the Vindhya and Satpura) and the Tapi flow west through rift valleys and end in estuaries. The short Western Ghats rivers fall steeply and make waterfalls: Jog on the Sharavati, Dudhsagar on the Mandovi; Chitrakote is on the Indravati and Dhuandhar on the Narmada.

Part 4, lakes and water management: Wular is the largest freshwater lake in India, Loktak (with its phumdis and the floating Keibul Lamjao park) the largest in the north-east, Sambhar the largest inland salt lake, Lonar a meteorite crater lake, and Chilika the largest brackish-water lagoon. River interlinking follows the National Perspective Plan of 1980, and the Ken-Betwa link in Bundelkhand is its first project, with the Panna Tiger Reserve as the main concern. Disputes between states go to a tribunal under Article 262 and the Inter-State River Water Disputes Act, 1956; the Kaveri case ended in a Supreme Court judgment in February 2018. India shares the Ganga with Bangladesh under the 1996 treaty and the Mahakali with Nepal under the 1996 treaty.

Exam traps

• The Indus-Ganga water divide is a barely raised strip of plain near Ambala, not a mountain range; in the Peninsula the main divide is the Western Ghats.
• Under the Indus Waters Treaty the EASTERN rivers (Ravi, Beas, Satluj) went to India and the WESTERN rivers (Indus, Jhelum, Chenab) to Pakistan; the Chenab is western even though it rises in India.
• The Alaknanda, not the Bhagirathi, passes four of the five prayags; the river is called the Ganga only below Devprayag.
• Kosi = 'sorrow of Bihar'; Damodar = 'sorrow of Bengal'. In Bangladesh the Brahmaputra is the Jamuna and the Ganga is the Padma.
• The Narmada and the Tapi flow west through rift valleys and end in estuaries, not deltas; the Godavari, Krishna and Kaveri rise in the Western Ghats yet flow east.
• Wular, not Dal, is India's largest freshwater lake; Lonar is a meteorite crater lake, not a volcanic one; Kolleru is freshwater, not a lagoon.
• Article 262 lets Parliament keep courts out of inter-state water disputes, yet the Supreme Court heard appeals in the Kaveri case and ruled in February 2018.

Recap

• Basins and divides: Indus-Ganga divide near Ambala; Western Ghats in the Peninsula; Ganga basin largest.
• Himalayan rivers: snow- and rain-fed, perennial, gorges, deltas; Indus, Satluj, Brahmaputra antecedent. Peninsular rivers: rain-fed, graded valleys.
• Indus system: Jhelum (Wular), Chenab (Chandra + Bhaga), Ravi, Beas (wholly in India), Satluj (Shipki La, Bhakra); Indus Waters Treaty 1960, in abeyance since April 2025.
• Ganga: Bhagirathi + Alaknanda at Devprayag; Yamuna at Prayagraj; Farakka; Padma. Brahmaputra: Tsangpo, Siang, Majuli, Jamuna.
• Peninsula: Godavari, Krishna, Kaveri, Mahanadi flow east to deltas; Narmada and Tapi flow west through rift valleys to estuaries; Jog on the Sharavati.
• Lakes: Wular, Loktak (Keibul Lamjao), Sambhar, Lonar, Chilika, Pulicat, Kolleru, Vembanad.
• Management: National Perspective Plan 1980, Ken-Betwa first link; Article 262 and the 1956 Act; Kaveri judgment February 2018; Ganga (Bangladesh) and Mahakali (Nepal) treaties 1996.

Practice questions

Sources

• Central Water Commission, Ministry of Jal Shakti, and India-WRIS: river basin atlas of India and basin reports of the Himalayan and peninsular rivers — https://cwc.gov.in
• Survey of India, Department of Science and Technology: physical map of India showing rivers and lakes — https://surveyofindia.gov.in
• The Indus Waters Treaty, 1960, between India and Pakistan (signed at Karachi, 19 September 1960) — https://www.mea.gov.in
• Ministry of External Affairs: decision of 23 April 2025 to hold the Indus Waters Treaty in abeyance; Ganga Water Treaty (1996) and Mahakali Treaty (1996) — https://www.mea.gov.in
• National Mission for Clean Ganga, Ministry of Jal Shakti: the Ganga as National River (2008) and the Namami Gange programme — https://nmcg.nic.in
• National Water Development Agency, Ministry of Jal Shakti: the National Perspective Plan (1980) and the Ken-Betwa link — https://nwda.gov.in
• Constitution of India, Article 262 — https://legislative.gov.in/constitution-of-india/
• Inter-State River Water Disputes Act, 1956; Supreme Court of India, State of Karnataka v. State of Tamil Nadu (16 February 2018) — https://jalshakti-dowr.gov.in
• Ministry of Environment, Forest and Climate Change: India's Ramsar sites and Keibul Lamjao National Park — https://moef.gov.in