Sierra Leone is very rich in minerals and has relied on mining, especially diamonds, for its economic base. The country is among the top 10 diamond producing nations in the world, and mineral exports remain the main foreign currency earner. Sierra Leone also claims to be home to the third largest natural harbour in the world, the Queen Elizabeth II Quay (also known as the QE II Quay and locally as the Deep Water Quay or Government Warf).
The country has a tropical climate, with a diverse environment ranging from savannah to rainforests.Freetown is the capital, largest city and economic center. English is the official language,spoken at schools, government administration and by the media. However, the Krio language (a language derived from English and several African languages and native to the Sierra Leone Krio people) is the most widely spoken language in virtually all parts of the country.