Context: During an official state visit to China, Bangladesh Prime Minister Tarique Rahman signed a strategic agreement with Beijing to accelerate a comprehensive feasibility study for the Teesta River Comprehensive Management and Restoration Project (TRCMRP).
About The Teesta River:
What It Is?
- The Teesta River is a major, high-velocity, glacier-fed transboundary river in South Asia. It serves as the primary hydrological lifeline for the Indian state of Sikkim and the northern plains of West Bengal, before functioning as a critical agricultural anchor for northwestern Bangladesh.
Origin (Source): It originates at an elevation of over 5,000 meters in the Eastern Himalayas from the Tso Lhamo (Cho Lhamo) Lake and is fed by glaciers including the Teesta Khangse glacier in North Sikkim.
National and State Boundaries Crossed:
- India: Flows through the mountainous terrain of Sikkim and the plains of West Bengal (Darjeeling, Kalimpong, and Jalpaiguri districts).
- Bangladesh: Crosses into northwestern Bangladesh through the Rangpur Division (Nilphamari and Rangpur districts).
Final Destination: The Teesta is a major tributary of the Jamuna River (which is the main channel of the Brahmaputra River system in Bangladesh), joining it at Fulchhari.
Tributaries of the Teesta:
- Right-Bank Tributaries: Dik Chhu, Kanaka Chhu, Rangyong Chhu, and the Rangeet River.
- Left-Bank Tributaries: Lachung Chhu, Lachen Chhu, Chakung Chhu, and Rani Khola.
Key Geological Features:
- High-Gradient Mountain Gorges: In Sikkim, the Teesta flows through steep Himalayan gorges with powerful rapids, carrying large amounts of sediment due to its high gradient.
- Sevoke Transition & Plains Spillway: At Sevoke, the river enters the plains, slows significantly, deposits sediments, and spreads into a broad channel across the Terai region.
- Braided Alluvial Channels & Monsoon Floods: In Bangladesh, the Teesta forms multiple shifting channels and sandbars, causing fertile silt deposition as well as frequent monsoon floods and erosion.
Geopolitical & Strategic Significance:
- Strategic Shield of the Siliguri Corridor: The Teesta Basin lies close to the strategic Siliguri Corridor, making foreign infrastructure projects in the region a major security concern for India.
- Core India–Bangladesh Water Dispute: Dry-season sharing of Teesta waters remains unresolved, with Bangladesh seeking greater allocations and West Bengal opposing additional upstream diversion.
- Flashpoint for Regional Geopolitics: China’s involvement in Bangladesh’s Teesta river projects has increased strategic competition, making the basin a key geopolitical hotspot in South Asia.
