Bihar, a state rich in cultural and geographical diversity, is home to numerous rivers that contribute significantly to its agriculture and livelihood. Among these rivers, the smallest river in Bihar holds a unique distinction, making it an important topic for competitive exams and general knowledge.
The Smallest River in Bihar
The smallest river in Bihar is the Karmanasa River. It is a tributary of the Ganges and originates in the Kaimur hills of Uttar Pradesh. The river is relatively short compared to other prominent rivers in Bihar, such as the Ganges, Gandak, and Kosi.
Geographical Significance
The Karmanasa River flows through Bihar before merging with the Ganges. Despite its small size, it plays a vital role in the local ecosystem, providing water resources for agriculture and sustaining biodiversity in the region.

Importance for Competitive Exams
Understanding the geographical features of Bihar, including its rivers, is crucial for students preparing for competitive exams like UPSC, BPSC, SSC, and state government exams. Questions related to the smallest and largest rivers often appear in the general knowledge and geography sections of these exams.
Historical Context
The Karmanasa River has historical significance as well. It is mentioned in ancient texts and has been a part of folklore. The name ‘Karmanasa’ is derived from Sanskrit, meaning ‘destroyer of good deeds,’ as per Hindu mythology. Historically, the river has been a boundary marker between different kingdoms and played a role in ancient trade routes.
Key Takeaways from Smallest River in Bihar
S.No | Key Takeaway |
---|---|
1 | The smallest river in Bihar is the Karmanasa River. |
2 | It originates in the Kaimur hills of Uttar Pradesh and merges with the Ganges. |
3 | The river is significant for local agriculture and biodiversity. |
4 | It holds historical and mythological importance in Indian culture. |
5 | Knowledge of Bihar’s rivers is essential for various competitive exams. |
FAQs (Frequently Asked Questions)
- Which is the smallest river in Bihar?
- The smallest river in Bihar is the Gandak River, a tributary of the Ganges. However, depending on local classifications, some smaller seasonal rivers may also be considered.
- Where does the smallest river in Bihar originate from?
- The Gandak River originates from the Nepal Himalayas before entering Bihar.
- What is the significance of the smallest river in Bihar?
- The river plays an important role in irrigation, agriculture, and maintaining ecological balance in the region.
- Which major rivers flow through Bihar?
- Apart from the smallest river, major rivers in Bihar include the Ganges, Kosi, Gandak, and Son.
- What is the impact of small rivers on Bihar’s agriculture?
- Small rivers contribute to local irrigation systems, help in groundwater recharge, and support fisheries, playing a key role in sustaining the agrarian economy of Bihar.
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