A map is a visual representation of an area -- a symbolic depiction highlighting relationships between elements of that space such as objects, regions and themes. Maps of the world or large areas are often either 'political' or 'physical'. The most important purpose of the political map is to show territorial borders; the purpose of the physical is to show features of geography such as mountains, soil type or land use. Geological maps show not only the physical surface, but characteristics of underlying rock, fault lines and subsurface structures. Dhaka is the capital of Bangladesh and the principal city of Dhaka district. According to the geographical map of Dhaka, it is located on the Buriganga river, in central Bangladesh. The city lies on the lower reaches of the Ganges delta and covers a total area of 815.85 square kilometers. It consists of seven principal thanes. Dhaka is within the monsoon climate zone, with an average temperature of 25 deg C (77 deg F) and monthly means varying between 18 deg C (64 deg F) in January and 29 deg C (84 deg F) in August. Nearly 80% of the annual average rainfall of 1,854 mm (73 in) occurs between May and September. Dhaka is located in one of the world's leading rice- and Jute-growing regions.
