Why this matters now
Ganga is tested for: 2,525-km length; Bhagirathi (Gangotri/Gomukh, Uttarkashi) + Alaknanda (Satopanth Glacier) source streams; Devprayag confluence at 30°09’N, 78°36’E where Ganga is officially named; Panch Prayag; major Himalayan tributaries (Yamuna, Ghaghara, Gandak, Kosi); peninsular tributaries (Son, Chambal, Damodar); Sundarbans delta world’s largest mangrove; Ganga Action Plan 1985; Namami Gange Mission January 2014 Rs 22,500+ crore; National River Ganga Basin Authority (NRGBA) 2009; National Waterway-1 (Haldia to Allahabad 1,620 km).
Source + Course
| Stage | Detail |
|---|---|
| Source (Bhagirathi) | Gomukh, Gangotri Glacier, Uttarkashi, Uttarakhand; 3,892 m elevation. Gangotri itself is at 3,100 m. |
| Source (Alaknanda) | Satopanth + Bhagirath Kharak glaciers below Nanda Devi. |
| Panch Prayag | (1) Vishnu Prayag (Alaknanda + Dhauli Ganga), (2) Nand Prayag (Alaknanda + Nandakini), (3) Karna Prayag (Alaknanda + Pindar), (4) Rudra Prayag (Alaknanda + Mandakini), (5) Dev Prayag (Alaknanda + Bhagirathi = Ganga). |
| Upper Course | Devprayag → Rishikesh → Haridwar (296 m, where Ganga enters plains). |
| Middle Course | Haridwar → Allahabad/Prayagraj (confluence with Yamuna, Triveni Sangam) → Varanasi (Kashi) → Patna → Bhagalpur. |
| Lower Course (Delta) | At Farakka (West Bengal) the river bifurcates: Bhagirathi-Hooghly (right) flows through Kolkata; Padma (left) enters Bangladesh, joins Brahmaputra (called Jamuna in Bangladesh) → Meghna → Bay of Bengal. |
| Delta: Sundarbans | World’s largest mangrove delta — ~10,000 sq km shared India + Bangladesh; UNESCO World Heritage; Royal Bengal Tigers. |
Tributaries
Left bank (Himalayan, all glacier-fed):
- Yamuna — 1,376 km, longest tributary; rises Yamunotri.
- Ghaghara (Karnali) — rises Mapchachungo glacier Tibet.
- Gandak (Kali Gandaki) — longest gorge in world; deepest gorge in world.
- Kosi (“Sorrow of Bihar”) — 729 km; floods.
- Mahananda.
Right bank (Peninsular):
- Chambal — rises Janapao Hills MP, joins Yamuna at Etawah; Chambal ravines.
- Son — rises Amarkantak; 784 km; flows into Ganga at Patna.
- Damodar (“Sorrow of Bengal”) — Damodar Valley Corporation 1948 dams.
- Punpun.
Major Cities + Tirthas on Ganga
Religious significance:
- Char Dham: Gangotri, Yamunotri, Kedarnath, Badrinath.
- Panch Prayag 5 sacred confluences.
- Haridwar — Kumbh Mela every 12 years.
- Rishikesh — Yoga Capital.
- Prayagraj (Allahabad) — Triveni Sangam with Yamuna + mythical Saraswati; Maha Kumbh Mela 13 Jan - 26 Feb 2025 (~66 crore pilgrims).
- Varanasi (Kashi) — 84 ghats; Kashi Vishwanath Temple.
- Patna + Bhagalpur + Kolkata (Hooghly distributary).
Cultural: Ganga personified as Goddess Ganga (daughter of King Himavan). Bhagiratha’s penance brought Ganga from heaven (Akash Ganga) to earth.
Conservation projects
| Project | Year | Detail |
|---|---|---|
| Ganga Action Plan I | 1985 by Rajiv Gandhi | Rs 462 cr; 25 cities target sewage. |
| Ganga Action Plan II | 1993 | Yamuna+Gomti+Damodar+Mahananda included. |
| NRGBA | 2009 | National Ganga River Basin Authority — PM chair. |
| National River declared | 4 Nov 2008 | Only Indian river so designated. |
| NAMAMI GANGE | Jan 2014 onwards | Flagship; Rs 22,500+ cr; 5 pillars: nirmal dhara (clean), aviral dhara (free-flowing), jan ganga, gyan ganga; >450 sewage treatment plants. |
| Clean Ganga Fund | 2014 | Voluntary contributions. |
| National Mission for Clean Ganga (NMCG) | 2011 → autonomous body 2016 | Implementing arm. |
| National Waterway 1 (NW-1) | 1986 declared; Jal Marg Vikas Project 2018 | Haldia → Allahabad 1,620 km; Rs 5,369 cr Vrinda Jal Marg. |
UPSC angle
Know GANGA RIVER SYSTEM — 2525 km Gomukh to Ganga Sagar; basin 8.6 lakh sq km (26% India + 40% population ~50 cr); BHAGIRATHI (Gomukh Gangotri Glacier Uttarkashi 3892 m) + ALAKNANDA (Satopanth+Bhagirath Kharak glaciers under Nanda Devi) source streams; PANCH PRAYAG: VishnuPrayag (Alaknanda+Dhauli Ganga), NandPrayag (Alaknanda+Nandakini), KarnaPrayag (Alaknanda+Pindar), RudraPrayag (Alaknanda+Mandakini), DEV PRAYAG (Alaknanda+Bhagirathi = Ganga 30deg09 N 78deg36 E); Devprayag→Rishikesh→HARIDWAR (296 m enters plains)→PRAYAGRAJ TRIVENI SANGAM Yamuna+Saraswati→Varanasi Kashi (84 ghats Kashi Vishwanath)→Patna→Bhagalpur; at FARAKKA bifurcates: Bhagirathi-Hooghly right thru Kolkata + PADMA left enters Bangladesh joins Brahmaputra (Jamuna) → Meghna → Bay of Bengal; DELTA SUNDARBANS world’s largest mangrove ~10000 sq km UNESCO Royal Bengal Tiger; LEFT TRIBUTARIES (Himalayan glacier-fed): Yamuna 1376 km longest tributary (Yamunotri), Ghaghara/Karnali (Mapchachungo Tibet), GANDAK/Kali Gandaki LONGEST + DEEPEST GORGE WORLD, Kosi 729 km “Sorrow of Bihar”, Mahananda; RIGHT TRIBUTARIES (Peninsular): CHAMBAL (Janapao Hills MP joins Yamuna Etawah, ravines), SON (Amarkantak 784 km), DAMODAR “Sorrow of Bengal” (DVC 1948), Punpun; CHAR DHAM Gangotri+Yamunotri+Kedarnath+Badrinath; KUMBH MELA Haridwar every 12 yrs, MAHA KUMBH PRAYAGRAJ 13 Jan-26 Feb 2025 ~66 crore pilgrims; NATIONAL RIVER declared 4 NOV 2008 (only Indian river); GANGA ACTION PLAN I 1985 Rajiv Gandhi Rs 462 cr 25 cities + GAP II 1993 added Yamuna+Gomti+Damodar+Mahananda; NRGBA 2009 PM chair; NAMAMI GANGE Jan 2014 Rs 22500+ cr 5 pillars Nirmal+Aviral+Jan+Gyan dhara 450+ STPs; NMCG 2011 → autonomous 2016; NW-1 1986 declared Jal Marg Vikas Project 2018 Haldia-Allahabad 1620 km Rs 5369 cr.
Frequently asked questions
Where does the Ganga originate?
As Bhagirathi from Gomukh, Gangotri Glacier, Uttarkashi (3892 m). It becomes Ganga at Dev Prayag where it joins Alaknanda from Satopanth Glacier.
What is the Triveni Sangam?
The confluence of Ganga + Yamuna + mythical Saraswati at Prayagraj (Allahabad) — site of the Maha Kumbh Mela held 13 January - 26 February 2025 (~66 crore pilgrims).
When was Ganga declared a National River?
On 4 November 2008 — Ganga is the only river in India to receive this designation.
What is Namami Gange?
The flagship cleanup mission launched January 2014 at Rs 22,500+ crore. 5 pillars: Nirmal Dhara, Aviral Dhara, Jan Ganga, Gyan Ganga + biodiversity. 450+ STPs.