Dhaka is Bangladesh's capital and largest city and is overseen by two city corporations who manage between them the northern and southern part of the city. There are 12 city corporations which hold mayoral elections: Dhaka South, Dhaka North, Chittagong, Comilla, Khulna, Mymensingh, Sylhet, Rajshahi, Barisal, Rangpur, Gazipur and Narayanganj. Mayors are elected for five-year terms. Altogether there are 506 urban centres in Bangladesh among which 43 cities have a population of more than 100,000.