Tripura State of India, Chhagalnaiya and Feni Sadar upazilas on the north, Sitakunda and Sandwip upazilas on the south, Fatikchhari upazila on the east, Sonagazi and Companiganj (Noakhali) upazilas on the west.

Mirsharai thana was turned into an upazila in 1983. The upazila consists of 16 union parishads, 100 mouzas and 207 villages.

Mirsharai Upazila is located in Chittagong District. Upazilla(s)/Thana(s) in Chittagong are Anwara Upazila, Bandar (Chittagong Port) Thana, Banshkhali Upazila, Boalkhali Upazila, Chandanaish Upazila, Chandgaon Thana, Double Mooring Thana, Fatikchhari Upazila, Hathazari Upazila, Kotwali Thana, Lohagara Upazila, Mirsharai Upazila, Pahartali Thana, Panchlaish Thana, Patiya Upazila, Rangunia Upazila, Raozan Upazila, Sandwip Upazila, Satkania Upazila, Sitakunda Upazila.

Hinguli Court Parr (embankment) built by Arakani Moghs, Valukia Dighi, Chuti Khan Mosque, Poragol Khan Dighi, Nai Duari (nine-door) Mosque, Daulat Bibi Mosque and Mahania Mosque.