Saint Lucia is a sovereign island country in the West Indies in the eastern Caribbean Sea on the boundary with the Atlantic Ocean. Part of the Lesser Antilles, it is located north/northeast of the island of Saint Vincent, northwest of Barbados and south of Martinique. It covers a land area of 617 km2 and reported a population of 165,595 in the 2010 census. Its capital is Castries. On 22 February 1979, Saint Lucia became an independent state and a member of the Commonwealth of Nations.