Mumbai City District is a district of Maharashtra in Konkan Division. As a city district, it has no headquarters or subdivisions. It, along with the Mumbai Suburban District, makes up the metropolis of Mumbai. This area is called the "Island City" or South Mumbai or Old Mumbai. It extends from Colaba in the south to Mahim and Sion in the north. The city has an area of 157 km2 (61 sq mi) and a population of 3,085,411.