Rampal upazila on the north, the bay of bengal on the south, Morrelganj and Sarankhola upazilas on the east, Dacope upazila on the west.

Mongla thana was established in 1976 and was turned into an upazila in 1983. It consists of 1 municipality 7 union parishads, 37 mouzas and 77 village.

Mongla Upazila is located in Bagerhat District. Upazilla(s)/Thana(s) in Bagerhat are Bagerhat Sadar Upazila, Chitalmari Upazila, Fakirhat Upazila, Kachua Upazila, Mollahat Upazila, Mongla Upazila, Morrelganj Upazila, Rampal Upazila, Sarankhola Upazila.