Rivers of Eastern UP — Ghaghra, Rapti & Gandak
Ghaghra (Saryu), Rapti, Gandak, and Sharda rivers of eastern Uttar Pradesh — origin, course, flood management, and exam facts for UPSSSC AGTA.
Rivers of Eastern UP
Eastern UP is drained by powerful Himalayan rivers that carry enormous volumes of water, making this region both fertile and flood-prone. These rivers are all left-bank tributaries of the Ganga.
Ghaghra (Saryu) — The Mightiest Tributary
The Ghaghra is the largest tributary of the Ganga by water discharge, carrying more water than even the Yamuna.
| Parameter | Detail |
|---|---|
| Origin | Mapchachungo glacier, Tibet (near Lake Mansarovar) |
| Also called | Karnali (in Nepal), Saryu (in Ayodhya), Gogra |
| Enters UP at | Bahraich district (from Nepal) |
| Total length | ~1,080 km |
| Joins Ganga at | Revelganj, near Chhapra (Bihar border) |
| Major UP cities | Bahraich, Barabanki, Ayodhya (Faizabad), Basti, Azamgarh |
Religious Significance: At Ayodhya, the river is called Saryu and is deeply sacred — Lord Rama’s birthplace is on its banks. The Ram Mandir is situated in Ayodhya on the banks of the Saryu.
Ghaghra Tributaries in UP
| Tributary | Joins Ghaghra at | Key Detail |
|---|---|---|
| Sharda (Mahakali) | Near Bahraich | Forms India-Nepal border in Uttarakhand |
| Rapti | Near Gorakhpur/Deoria | Major flood-causing river |
| Chhoti Saryu | Near Bahraich | Smaller tributary from Terai |
| Kuwano (Kuwana) | Near Basti | Drains central-eastern UP |
Rapti River
| Parameter | Detail |
|---|---|
| Origin | Lower Himalayas in Nepal (Rukumkot range) |
| Enters UP at | Near Bahraich/Siddharthnagar border |
| Flows through | Gorakhpur (city is on Rapti banks) |
| Joins | Ghaghra near Deoria district |
| Length | ~640 km (including Nepal stretch) |
| Key concern | Annual floods in Gorakhpur — causes massive damage to crops and settlements |
The Rapti and its tributary Rohini are the primary cause of flooding in the Gorakhpur region every monsoon season.
Gandak River
| Parameter | Detail |
|---|---|
| Origin | Nepal Himalayas (near Tibet border) |
| Also called | Narayani (in Nepal), Salagrami |
| Enters India at | Triveni (Champaran, Bihar) |
| Role in UP | Forms part of the UP-Bihar border (Kushinagar/Deoria area) |
| Joins Ganga at | Near Hajipur (opposite Patna), Bihar |
| Total length | ~630 km |
| Key feature | Gandak Canal (Triveni Canal) irrigates parts of eastern UP and Bihar |
Sharda (Mahakali) River
| Parameter | Detail |
|---|---|
| Origin | Milan glacier, Greater Himalayas (Uttarakhand-Nepal border) |
| Also called | Mahakali (in Nepal), Kali |
| International role | Forms India-Nepal border for ~80 km |
| Enters UP plains | Near Pilibhit/Lakhimpur Kheri |
| Joins | Ghaghra near Bahraich |
| Key project | Sharda Canal — major irrigation source for Terai and Rohilkhand regions |
| Treaty | Mahakali Treaty (1996) between India and Nepal for water sharing |
Flood Problem in Eastern UP
Eastern UP faces severe annual flooding due to the Himalayan rivers:
| Factor | Detail |
|---|---|
| Most flood-prone districts | Gorakhpur, Deoria, Kushinagar, Ballia, Bahraich, Lakhimpur |
| Main flood rivers | Ghaghra, Rapti, Gandak, Sharda |
| Cause | Heavy monsoon rainfall + snowmelt from Himalayas + flat terrain |
| Impact | Crop loss, displacement, waterlogging, spread of diseases |
| Flood management | Embankments, Rapti River channelization, flood forecasting by CWC |
| NDRF presence | Dedicated battalions stationed in Gorakhpur and Varanasi |
Exam Tip: Eastern UP rivers are perennial (fed by glaciers and monsoon both) unlike peninsular rivers that are largely rain-fed.
Comparison of Eastern UP Rivers
| River | Origin | Enters UP at | Joins | Discharge Rank |
|---|---|---|---|---|
| Ghaghra | Tibet | Bahraich | Ganga (Bihar border) | 1st (highest discharge) |
| Gandak | Nepal | UP-Bihar border | Ganga (Hajipur) | 2nd |
| Rapti | Nepal | Siddharthnagar | Ghaghra (Deoria) | 3rd |
| Sharda | Uttarakhand-Nepal | Pilibhit/Lakhimpur | Ghaghra (Bahraich) | 4th |
Key Takeaways
- Ghaghra is the largest Ganga tributary by discharge — called Saryu at Ayodhya
- Rapti flows through Gorakhpur and causes annual floods in eastern UP
- Gandak forms part of the UP-Bihar border
- Sharda (Mahakali) forms the India-Nepal border; Sharda Canal is vital for Terai irrigation
- Eastern UP is India’s most flood-prone region due to Himalayan rivers on flat terrain
Summary Cheat Sheet
| Fact | Answer |
|---|---|
| Largest Ganga tributary by discharge | Ghaghra |
| Ghaghra called at Ayodhya | Saryu |
| Ghaghra origin | Mapchachungo glacier, Tibet |
| Rapti flows through | Gorakhpur |
| Gandak also called | Narayani (in Nepal) |
| Sharda forms border with | Nepal |
| Mahakali Treaty year | 1996 |
| Most flood-prone UP districts | Gorakhpur, Deoria, Kushinagar, Ballia |
| Ghaghra enters UP at | Bahraich |
| Sharda Canal irrigates | Terai, Rohilkhand |
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