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Dhaka is located in central Bangladesh at 23?42'0"N, 90?22'30"E, on the eastern banks of the Buriganga River. The city lies on the lower reaches of the Ganges Delta and covers a total area of 815.85 km?. It consists of seven principal thanas Dhanmondi, Kotwali, Motijheel, Paltan, Ramna, Mohammadpur, Sutrapur, Tejgaon and 14 auxiliary thanas Gulshan, Lalbagh, Mirpur, Pallabi, Sabujbagh, Dhaka Cantonment, Demra, Hazaribagh, Shyampur, Badda, Kafrul, Kamrangir char, Khilgaon and Uttara. In total the city has 130 wards and 725 mohallas. Dhaka district has an area of 1463.60 km? (565 mi?); and is bounded by the districts of Gazipur, Tangail, Munshiganj, Rajbari, Narayanganj, Manikganj. Tropical vegetation and moist soils characterise the land, which is flat and close to sea-level. This leaves Dhaka susceptible to flooding during the monsoon seasons owing to heavy rainfall and cyclones.
Dhaka experiences a hot, wet and humid tropical climate. The city is within the monsoon climate zone, with an annual average temperature of 25 ?C (77 ?F) and monthly means varying between 18 ?C (64 ?F) in January and 29 ?C (84 ?F) in August. Nearly 80% of the annual average rainfall of 1,854 mm (73 in) occurs between May and September. The environment of Dhaka is facing serious threats from pollution caused by the city's rapid expansion, congestion and industrial activities. Increasing air and water pollution emanating from traffic congestion and industrial waste are serious problems affecting public health and the quality of life in the city.

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