Arrah, city in northeastern India, in Bihar State, capital of Shahabad District, on the Patna Canal, near the city of Patna. Arrah is the trading center of a farming region that produces grain, oilseeds, and sugarcane. In 1857, during the Sepoy Rebellion, a small group of Europeans and loyal Indians successfully defended an isolated dwelling in the city against a large force of mutineers. Population (1991) 156,871.
