Q. Which of the following rivers divide the boundary of Bihar and Uttar Pradesh?
Answer: Karmnasha, Gandak and Ghaghra
Notes: The group of Karmnasha, Gandak and Ghaghra  rivers divide the boundary of Bihar and Uttar Pradesh. The Karmanasa River  is a tributary of the river Ganges. It originates in Kaimur district which is in Bihar. It flows through Uttar Pradesh and Bihar. Along the boundary between Uttar Pradesh and Bihar, it has the districts of Sonbhadra, Chandauli, Varanasi and Ghazipur on its left (UP side) and the districts of Kaimur  and Buxar on its right (Bihar side). Gandak river is a left bank tributary of the Ganges in India. It originates in Tibet and enters India from Nepal. It forms the border between Uttar Pradesh and Bihar. Ghaghra river originates in Tibet. It is a left bank tributary of Ganga. It flows southeast through Uttar Pradesh and Bihar  states to enter the Ganges below Chapra after a 600-mile (970-km) course.

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