A French overseas department of northeast South America on the Atlantic Ocean. Settlement by the French began in 1604, but the area was largely ignored until penal colonies (now closed) were established in the 19th century. Cayenne is the capital and the largest city. Population: 72,012. a country in northeast South America which is a department of France. Population: 177,562 (2001). Capital: Cayenne. French Guyane Française Overseas department (pop., 2002 est.: 172,000) of France, northeastern coast of South America. It has an area of 33,399 sq mi (86,504 sq km) and is bounded by Brazil to the south and east, by Suriname to the west, and by the Atlantic Ocean to the northeast. The capital is Cayenne. Most of French Guiana is low-lying, with mountains in the south and a swampy coastal plain. The Maroni River forms the border with Suriname. French Guiana's population is mostly Creole. The principal languages are French (official) and creole; nine-tenths of the people are Roman Catholic. Originally settled by the Spanish, French, and Dutch, the territory of French Guiana was awarded to France in 1667, and the inhabitants were made French citizens after 1877. By 1852 the French began using the territory for penal settlement; the penal colony at Devils Island was notorious. French Guiana became a department of France in 1946; the penal colonies were closed by 1953