Arrah is a city and a municipal corporation in Bhojpur district in the state of Bihar, India. The actual name of Arrah is Ara but it was misspelt by the British and now corrected to Ara but still known as Arrah in many records.
It is the district headquarters of Bhojpur district, located near the confluence of the Ganges and Sone rivers, some 24 mi. from Danapur and 36 miles from Patna. Arrah is an ancient city with references in mythological stories and Greek geographical works. It has been a centre of attraction for Jainism with dozens of old temples and hermitages. It is known for the important battle (Battle of Buxar) in October, 1764, when Mir Kasim, Nawab of Bengal with the support of the Mughal Emperor Shah Alam II and Shuja-ud-daulla, Nawab of Avadh was defeated by the East India Company Army whilst Henry Vansittart, was Governor General , the key event establishing the British colonialisation of India.