description Koshi River Overview
The Koshi, or Kosi, is a transboundary river of the Himalaya and the Ganges basin. It is formed by several Himalayan tributaries, crosses Nepal, enters the Indian state of Bihar, and joins the Ganges near Kursela. Its broad alluvial fan and unstable channels have repeatedly shifted across the northern plains, while monsoon floods have caused major damage and displacement, giving it the informal name Sorrow of Bihar.
help Koshi River FAQ
Where does the Koshi River flow?
The Koshi, also called the Kosi, is formed by Himalayan tributaries in Nepal. It enters Bihar in India and joins the Ganges near Kursela.
Why is the Koshi River known for changing course?
The river carries large amounts of sediment onto a broad alluvial fan, where channels can shift over time. This instability has contributed to severe flooding in Bihar and Nepal.
Is the Koshi River in Nepal or India?
It is a transboundary river shared by both countries. Its Himalayan tributaries and upper course are in Nepal, while the river continues through India's Bihar state.
What river does the Koshi join?
The Koshi joins the Ganges near Kursela in Bihar. It is therefore part of the wider Ganges river basin.
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