French Guiana is a country in the South America continent. The official currency of French Guiana is the "Euro (EUR)". The Alpha-2 Country code of French Guiana is "GF". What is the capital of French Guiana? Of course the capital city is Cayenne. French Guiana has an area of "83534" square kilometers (km²). French Guiana's official language is French and the population is over 289763.