Sarail and Nasirnagar upazilas on the north, Akhaura, Kasba and Nabinagar upazilas on the south, Madhabpur upazila and Tripura (India) on the east, Bhairab and Raipura upazilas on the west.

Brahmanbaria thana was turned into an upazila in 1984. The upazila consists of one municipality, 4 wards, 27 union parishads, 378 mouzas and 398 villages.

Brahmanbaria Sadar Upazila is located in Brahmanbaria District. Upazilla(s)/Thana(s) in Brahmanbaria are Akhaura Upazila, Bancharampur Upazila, Brahmanbaria Sadar Upazila, Kasba Upazila, Nabinagar Upazila, Nasirnagar Upazila, Sarail Upazila.

Kal Bhairab Mandir.