French Guiana is part of the French territory, and uses the euro as their currency.
Euro
British Guiana (now Guyana)Dutch Guiana (now Suriname)French GuianaThe three are still often collectively referred to as the Guianas.
France adopted the Euro during the year 2001. Before that the French currency was the French Franc.
France adopted Euro as its currency in 1999. Before adopting Euro the French currency was French Francs. Euro is adopted by 18 of 28 member countries of European union.
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The Euro is the currency of France and most all the other European countries. It replaced the French francs, called "francs français" in French, which were phased out in 2001.
French
The Spanish, Portuguese, British, French, and Dutch all influenced the Guianas.
The french
British Guiana (now Guyana)Dutch Guiana (now Suriname)French GuianaThe three are still often collectively referred to as the Guianas.
Guyana, French Guiana, and Suriname, plus parts of Venezuela and Brazil.
How are the Guianas different from the rest of the region
The Guianas were originally five countries. But ended up by being three. The three Guyanas were different because they each spoke a different language to the rest of South America. British Guiana (English) Dutch Guiana (Dutch) and French Guiana (French).
The French currency before 2002 was the French franc. Since then it is the Euro.
The currency of all parts of France is the Euro. This includes French Guiana.
The currency in French Polynesia is Franc and its code is XPF
French Guiana is still a French dependency and elects deputies to the National Assembly in Paris. Guyana (formerly British Guyana) and Surinam (Dutch Guiana) are both independent countries.
Before the Euro was introduced in Europe, the French currency was measured in Francs.