Tangail is a district (zila) in the central region of Bangladesh. In 1969, Tangail district was created by Tangail Mohokuma from its 237 square kilometers of land and 3177 square kilometers of land acquired from Mymensingh district. It is the largest district of Dhaka division by area and second largest by population. The population of Tangail zila is about 4 million and its area is 3,414.28 square kilometres (1,318.26 sq mi). The main city of the district is Tangail. It is surrounded by Jamalpur District on the north, the Dhaka and Manikganj Districts on the south, Mymensingh and Gazipur on the east, and Sirajganj on the west.

Dhaka District is a district in central Bangladesh, and is the densest district in the nation. It is a part of the Dhaka Division. Dhaka, the capital of Bangladesh, and rests on the eastern banks of the Buriganga River which flows from the Turag to the southern part of the district. While Dhaka occupies only about a fifth of the area of Dhaka district, it is the economic, political and cultural centre of the district and the country. Dhaka District consists of Dhaka, Keraniganj, Nababganj, Dohar, Savar and Dhamrai upazila. Dhaka District is an administrative entity, and like many other cities, it does not cover the modern conurbation which is Greater Dhaka, which has spilled into neighbouring districts, nor does the conurbation cover the whole district, as there are rural areas within the district.