Sierra Leone, officially the Republic of Sierra Leone, is a country in West Africa. It is bordered by Guinea on the north, Liberia in the south-east, and the Atlantic Ocean in the south-west. Sierra Leone has a tropical climate, with a diverse environment ranging from savannah to rainforests. It is divided into four geographical regions: the Northern Province, Eastern Provice, Southern Province and the Western Area, which are subdivided into fourteen districts. Freetown is the capital, largest city and its economic and political centre. Bo is the second largest city. The other major cities are Kenema, Makeni, and Koidu Town.

About sixteen ethnic groups inhabit Sierra Leone, each with its own language and customs. Predominantly a Muslim country, Sierra Leone is regarded as one of the most religiously tolerant nations in the world. Muslims and Christians collaborate and interact with each other peacefully. Religious violence is very rare in the country.

It is also among the largest producers of titanium and bauxite, a major producer of gold, and has one of the world's largest deposits of rutile. Sierra Leone is home to the third-largest natural harbour in the world.