Sierra Leone is located on the coast of West Africa facing the Atlantic Ocean. Freetown Capital of Sierra Leone largest city in Sierra Leone major port city in the Atlantic Ocean. Sierra Leone was colonized by British abolitionist in 1787. In 1808, the British government began to administer the colony. Although some people resisted the British influence, many saw this colonization as an opportunity for a better life.The British Committee decided to create a town in Africa for freed slaves. The British settlers landed in Sierra Leone and named the port city Freetown, which is still the capital of Sierra Leone today.