Dhaka is located in central Bangladesh at , 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 360 square kilometres (140 sq mi). It consists of eight principal thanas –Lalbagh, Kotwali, Sutrapur, Ramna, Motijheel, Paltan, Dhanmondi, Mohammadpur, Tejgaon – and 16 auxiliary thanas – Gulshan, Mirpur, Pallabi, Shah Ali, Turaag, 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 square kilometres (565 sq mi); and is bounded by the districts of Gazipur, Tangail, Munshiganj,Rajbari, Narayanganj, Manikganj. Tropical vegetation and moist soils characterize the land, which is flat and close to sea level. This leaves Dhaka susceptible to flooding during themonsoon seasons owing to heavy rainfall and cyclones.