Chittagong (Bengali: চট্টগ্রাম, Chôţţogram) is Bangladesh's main seaport and its second-largest city. The capital of the eponymous district and division, it is situated in the southeastern portion of the country, and was built on the banks of the Karnaphuli River, which ends nearby, in the Bay of Bengal. The city has a population of 3.9 million, and is constantly growing. Much of the city is surrounded by hilly terrains. The Chittagong Hill Tracts range is situated nearby.
Being the country's primary port, Chittagong is the main route for almost all of Bangladesh's import and export, generating a major portion of the country's annual revenue and being its commercial center Its harbor contains extensively developed port facilities and is particularly suitable for ocean steamers. Two large environmental centers ("ecoparks"), catering to ecology and forestry-related research, have recently been built in neighboring Sitakunda and Bashkhali.