Sierra Leone, officially the Republic of Sierra Leone, is a country in West Africa. It is borered by Guinea in the northeast, Liberia in the southeast, and the Atlantic Ocean in the southwest. Sierra Leone covers a total area of 71,740 sq km (27,699 sq mi) and has a tropical climate, with a diverse environment ranging from savannah to rainforests.Freetown is the capital, seat of government, and largest city. Other major cities in the country with a population over 100,000 are Bo, Kenema, Koidu Town and Makeni.