Sierra Leone , officially the Republic of Sierra Leone, informally Salone, is a country on the southwest coast of West Africa. It is bordered by Liberia to the southeast and Guinea to the northeast. Sierra Leone has a tropical climate with a diverse environment ranging from savanna to rainforests, a total area of 71,740 km (27,699 sq mi) and a population of 7,092,113 as of the 2015 census. The capital and largest city is Freetown. The country is divided into five administrative regions which are subdivided into sixteen districts. Sierra Leone is a constitutional republic with a unicameral parliament and a directly elected president. Sierra Leone is a Muslim majority country at approximately 78%, though with a politically influential Christian minority at about 21%. Sierra Leone achieved independence from the United Kingdom on 27 April 1961, and Milton Margai became the country's first Prime Minister. Sierra Leone held its first general election as an independent nation on May 27, 1962. Siaka Stevens was democratically elected Prime Minister in 1967, however, once in office, he became increasingly authoritarian during his rule from 1968 to 1985. From 1978 to 1985, Stevens' APC party was the only legal political party in Sierra Leone, and all other political parties were banned. The multiparty democratic constitution of Sierra Leone was again adopted in 1991 by President Joseph Saidu Momoh, Stevens' hand-picked choice. From March 23, 1991, to 2002, a group of former Sierra Leone soldiers launched a brutal civil war in a failed attempt to overthrow the Sierra Leone Government. The APC's 24-year rule of Sierra Leone ended on April 29, 1992, in a military coup and a 25-year-old Captain Valentine Strasser ruled the country from 1992 to 1996 in a junta government. Sierra Leone returned to a democratically elected government when the military junta under Brigadier Julius Maada Bio handed the presidency to Ahmad Tejan Kabbah of the Sierra Leone People's Party (SLPP) after his victory in the 1996 election.