description Kosi Overview
The Kosi River is a transboundary river of the Himalayas and the Ganges basin, flowing from Nepal into the Indian state of Bihar. It is formed by several Himalayan tributaries and carries a sediment-rich flow across a broad alluvial plain. Its braided channels can shift during floods, creating recurring risks for settlements and farmland in northern Bihar.
help Kosi FAQ
Where does the Kosi River flow?
The Kosi is a transboundary Himalayan river that flows from Nepal into Bihar in India. It belongs to the Ganges basin and eventually contributes its water to that wider river system.
Why does the Kosi have braided channels?
The river carries a heavy sediment load from the Himalayas across a broad alluvial plain. That combination encourages multiple channels to divide, merge, and shift over time.
Why is the Kosi associated with flooding in Bihar?
Its sediment-rich flow and shifting channels can redirect water across the alluvial plain during major floods. This is why the Kosi has long been associated with severe flood risk in Bihar.
Is the Kosi River entirely in India?
No, the Kosi crosses an international boundary between Nepal and India. Its Himalayan tributaries gather in Nepal before the river enters Bihar.
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