Bagaha is a city and municipality located in the West Champaran district of Bihar, India. It serves as the headquarters for the Bagaha subdivision and functions as a Police District.
The town is situated on the banks of the Gandak River, positioned approximately 64 kilometres northwest of the district headquarters, Bettiah, and 294 kilometres from the state capital, Patna. Geographically, it lies in close proximity to the India–Nepal border and the Valmiki Tiger Reserve.