Sierra Leone, officially the Republic of Sierra Leone, is a country on the southwest coast of West Africa. It shares its southeastern border with Liberia, and the northern half of the nation is surrounded by Guinea. Covering a total area of , Sierra Leone has a tropical climate, with diverse environments ranging from savanna to rainforests. The country has a population of 7,092,113 as of the 2015 census. Freetown is the capital and largest city. The country is divided into five administrative regions, which are subdivided into 16 districts. Sierra Leone is a constitutional republic with a unicameral parliament and a directly elected president serving a five-year term with a maximum of two terms. The current president is Julius Maada Bio. Sierra Leone is a secular nation with the constitution providing for the separation of state and religion and freedom of conscience (which includes freedom of thoughts and religion). Muslims make up about three-quarters of the population, though with an influential Christian minority. Religious tolerance in the West African nation is very high and is generally considered a norm and part of Sierra Leone's cultural identity. The geographic area has been inhabited for millennia, but Sierra Leone, as the country and its borders are known today, was founded by the British Crown in two phases: first, the coastal Sierra Leone Colony in 1808 (for returning Africans after the abolition of slavery); second, the inland Protectorate in 1896 (as the Crown needed to establish more dominion inland following the outcome of the Berlin Conference of 1884–1885). Hence, the country formally became known as the Sierra Leone Colony and Protectorate or simply British Sierra Leone. Sierra Leone gained independence from the United Kingdom on 27 April 1961, and became a Commonwealth realm on the same day; the country's name changed to the Dominion of Sierra Leone. Sir Milton Margai became Sierra Leone's first prime minister. During the few decades following independence, Sierra Leone witnessed an increase in political activities, transformations, turmoil, humanitarian and socio-economic crises. The country had its first general elections as an independent nation on 27 May 1961. Margai's Sierra Leone People's Party (SLPP) won a plurality of parliamentary seats and he was re-elected Prime Minister. A new constitution was adopted in 1971, paving the way for Sierra Leone becoming a republic, and Siaka Stevens, leader of the All People's Congress (APC), becoming the first executive president of the Republic