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Bihar topography can be easily described as a fertile alluvial plain occupying the Gangetic Valley. Bihar is opulently gifted with numerous natural water resources which are both the ground water resource and the surface water resource. The flow of the large and small water bodies and the major Bihar Rivers and its tributaries is considerably good in the entire state. Rainfall in Bihar is also one of the prominent factors for natural water supply in and around Bihar. Holy River Ganga is the major river of Bihar, which is joined by its various tributaries well connected with their sources in the Himalayas. These are some of the popular tributaries of Ganga River in Bihar, the Saryu (Ghaghra), Gandak, Budhi Gandak, Bagmati, Kamla-Balan and Mahananda. Other than Ganga, Kosi River, Son River, Gandaki River, Ajay River and Mahananda River are also prime rivers in Bihar.
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