Feni is a coastal district situated in the south-east of Bangladesh, within the Chittagong Division. One of Bangladesh's smallest districts, it is strategically located along the Dhaka–Chittagong transportation corridor. Bordered by India to the north and the Bay of Bengal to the south, it serves as the sole entry point linking Chittagong, the country's primary port city, to the northern districts.

Chittagong Division, officially known as Chattogram Division, is geographically the largest of the eight administrative divisions of Bangladesh. It covers the south-easternmost areas of the country, with a total area of 34,529.97 km2 (13,332.10 sq mi) and a population at the 2022 census of 33,202,326. The administrative division includes mainland Chittagong District, neighbouring districts and the Chittagong Hill Tracts.