Teesta River: Origin, Dispute & India-Bangladesh Relations
Complete UPSC guide to the Teesta River — origin in Sikkim, course through West Bengal and Bangladesh, the Teesta water-sharing dispute, and its significance for India-Bangladesh relations.
The Teesta River is a transboundary river that originates in Sikkim, flows through West Bengal in India, and enters Bangladesh where it joins the Brahmaputra (Jamuna). The Teesta water-sharing dispute between India and Bangladesh has been one of the most persistent irritants in bilateral relations — a nearly-agreed deal was blocked at the last moment in 2011 and remains unresolved.
For UPSC, the Teesta connects Physical Geography (GS1), International Relations (GS2 — India-Bangladesh relations), and Environment (river management, climate change impacts).
Origin and Course
| Feature | Details |
|---|---|
| Origin | Tso Lhamo Lake (also spelled Cholamu), North Sikkim, at ~5,330 m altitude |
| Length | ~315 km (India: ~115 km in Sikkim + ~122 km in West Bengal; Bangladesh: ~78 km) |
| States/countries | Sikkim → West Bengal → Bangladesh |
| Joins | Brahmaputra (Jamuna) river in Bangladesh (Rangpur Division) |
| Major tributaries | Rangit (Sikkim), Great Rangit, Lachung Chu, Zemu Chu |
| Type | Himalayan, snow-fed river with glacial and monsoon recharge |
The Teesta descends rapidly from the Sikkim Himalayas — dropping from ~5,300 m to ~30 m in just ~315 km — making it one of the most geomorphologically active rivers in the Eastern Himalayas. This steep gradient makes it valuable for hydropower but also prone to devastating floods and landslides.
Key infrastructure:
- Teesta Barrage (Gazoldoba, West Bengal) — India's main diversion structure; diverts water for irrigation in North Bengal through the Teesta Canal system
- Multiple hydropower projects in Sikkim — the Teesta basin has several operational and planned hydropower projects (Teesta-III, Teesta-V, Teesta-VI)
The Teesta Water-Sharing Dispute
The Core Issue
The Teesta's water is critical for both countries:
- India (West Bengal): North Bengal's agriculture depends on Teesta water for irrigation, particularly during the dry season (November–May). The Teesta Barrage at Gazoldoba diverts water into canals irrigating Jalpaiguri and Cooch Behar districts.
- Bangladesh: The Teesta is the fourth largest transboundary river entering Bangladesh. It irrigates the Rangpur Division — one of Bangladesh's poorest and most flood-prone regions. During the dry season, Bangladesh receives drastically reduced flows because of upstream diversion at Gazoldoba.
Timeline of Negotiations
| Year | Development |
|---|---|
| 1983 | Ad hoc water-sharing agreement: India 39%, Bangladesh 36%, reserve 25% |
| 1996 | Ganges Water Treaty signed (for the Ganges/Padma), but Teesta left unresolved |
| 2011 | Near-agreement: India and Bangladesh reached an ad hoc deal during PM Manmohan Singh's Dhaka visit. The proposed formula: India 42.5%, Bangladesh 37.5% |
| 2011 | West Bengal CM Mamata Banerjee refused to endorse the deal at the last moment, withdrawing from the PM's delegation. The agreement was shelved. |
| 2015–present | Multiple attempts to revive negotiations; no formal agreement |
| 2023 | Bangladesh proposed involving China for Teesta river management — India expressed concern |
Why Was the 2011 Deal Blocked?
The Teesta dispute has a federal dimension that makes it different from other transboundary disputes:
Constitutional position: Water is a State List subject (Entry 17, List II). While the Centre can negotiate international treaties, it needs the cooperation of the concerned state for implementation — particularly when a barrage/dam is on state territory.
West Bengal's concerns:
- North Bengal farmers depend heavily on Teesta irrigation
- The dry-season flow is already insufficient for domestic needs
- Mamata Banerjee argued that any water shared with Bangladesh would come at the expense of West Bengal farmers
- The state government was not adequately consulted during the negotiation
Bangladesh's frustration:
- Bangladesh argues that it is the lower riparian state and is entitled to a fair share under international water law
- Dry-season water scarcity causes crop failures in Rangpur Division
- The dispute has become a recurring irritant in India-Bangladesh relations
China Factor
In 2020–2023, Bangladesh explored Chinese involvement in Teesta basin management:
- China offered a $1 billion project for river management and dredging in the Teesta basin within Bangladesh
- India expressed concern about Chinese infrastructure presence in a strategically sensitive area
- This introduced a geopolitical dimension to what was previously a bilateral resource dispute
Environmental Issues
Floods: The Teesta is prone to devastating floods during the monsoon. Flash floods from Sikkim cause destruction in North Bengal and Bangladesh.
Erosion: The river's geomorphological activity causes severe bank erosion — entire villages have been displaced in North Bengal and Bangladesh.
Hydropower vs. ecology: Multiple hydropower projects in Sikkim alter the river's flow regime. The 2023 Teesta glacial lake outburst flood (GLOF) — triggered by a glacial lake breach following heavy rainfall — destroyed the Teesta-III dam in Sikkim and caused widespread damage, raising questions about hydropower development in fragile Himalayan basins.
Climate change: Accelerated glacial melting initially increases river flow but will eventually reduce it as glaciers shrink. This makes the long-term water-sharing equation even more uncertain.
Comparison with Other Transboundary River Disputes
| River | Countries | Status |
|---|---|---|
| Teesta | India–Bangladesh | Unresolved; 2011 near-deal blocked by West Bengal |
| Ganges (Padma) | India–Bangladesh | Resolved — Ganges Water Treaty (1996), 30-year agreement |
| Indus | India–Pakistan | Indus Water Treaty (1960) — under stress but operational |
| Brahmaputra | India–China–Bangladesh | No formal treaty; China building dams upstream |
| Kaveri | Karnataka–Tamil Nadu (interstate) | Resolved by SC-constituted tribunal; SC final order 2018 |
UPSC Relevance
GS1 (Geography): Indian river systems, transboundary rivers, Himalayan hydrology.
GS2 (IR): India-Bangladesh relations, water diplomacy, federal dimensions of foreign policy.
GS3 (Environment): GLOF risk, hydropower in Himalayas, climate change impacts.
Key Prelims facts:
- Origin: Tso Lhamo Lake, North Sikkim
- Length: ~315 km
- Flows through: Sikkim → West Bengal → Bangladesh
- Joins: Brahmaputra (Jamuna) in Bangladesh
- Teesta Barrage: Gazoldoba, West Bengal
- 2011 near-deal: India 42.5%, Bangladesh 37.5% — blocked by West Bengal
- Water is a State List subject (Entry 17, List II)
- Ganges Water Treaty: 1996 (resolved for Ganges, not Teesta)
- 2023 GLOF: Destroyed Teesta-III dam in Sikkim