Arrah is a city and a municipal corporation in Bhojpur district in the Indian state of Bihar. It is the headquarters of Bhojpur district, located near t…Arrah is a city and a municipal corporation in Bhojpur district in the Indian state of Bihar. It is the headquarters of Bhojpur district, located near the confluence of the Ganges and Sone rivers, some 24 miles from Danapur and 36 miles from Patna.