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Sierra Leone (/siˌɛrə liˈoʊn, -ˈoʊni/, UK also /siˌɛərə-, ˌsɪərə-/), officially the Republic of Sierra Leone, is a country in West Africa. It is bordered by Guinea to the northeast, Liberia to the southeast and the Atlantic Ocean to the southwest. It has a tropical climate, with a diverse environment ranging from savanna to rainforests. The country has a total area of 71,740 km² (27,699 sq mi) and a population of 7,075,641 as of the 2015 census.Sierra Leone is a constitutional republic with a directly elected president and a unicameral legislature. Sierra Leone has a dominant unitary central government. The country's capital and largest city is Freetown (population 1,050,301). The second most populous city is Kenema (population 200,354) located 200 miles from Freetown. Sierra Leone is made up of five administrative regions: the Northern Province, North West Province, Eastern Province, Southern Province and the Western Area. These regions are subdivided into sixteen districts, which are further divided into 190 chiefdoms..