Bangladesh is in the low-lying Ganges¨CBrahmaputra River Delta or Ganges Delta. This delta is formed by the confluence of the Ganges, Brahmaputra (Jamuna or Jomuna also known as "Yamuna"), and Meghna rivers and their respective tributaries. The Ganges unites with the Jamuna (main channel of the Brahmaputra) and later joins the Meghna to eventually empty into the Bay of Bengal.
Bangladesh is divided into seven administrative divisions,each named after their respective divisional headquarters: Barisal, Chittagong, Dhaka, Khulna, Rajshahi, Sylhet and Rangpur.
Divisions are subdivided into districts (zila). There are 64 districts in Bangladesh, each further subdivided into upazila (subdistricts) or thana. The area within each police station, except for those in metropolitan areas, is divided into several unions, with each union consisting of multiple villages. In the metropolitan areas, police stations are divided into wards, which are further divided into mahallas. There are no elected officials at the divisional or district levels, and the administration is composed only of government officials. Direct elections are held for each union (or ward), electing a chairperson and a number of members. In 1997, a parliamentary act was passed to reserve three seats (out of 12) in every union for female candidates.
Dhaka is the capital and largest city of Bangladesh. Other major cities include Chittagong, Khulna, Rajshahi, Sylhet, Barisal, Bogra, Comilla, Mymensingh and Rangpur. These cities have mayoral elections, while other municipalities elect a chairperson. Mayors and chairpersons are elected for a span of five years.