In French Guiana, French is spoken. The country's official name is Guyane. But it also is called Guyane française, to avoid confusion with [former British] Guyana.
Brazil, Portuguese
Portuguese, as the official language, is spoken the citizens of the South American country of Brazil. As one of the nine recognized regional languages, it's spoken by the citizens of the South American country of The Co-operative Republic of Guyana, where the official language is English. As a compulsory subject for study by schoolchildren, and due to considerable interaction across national boundaries, it's spoken by the citizens of the nearby South American countries of Argentina and Uruguay. And due to their nearness to Latin America's biggest country, it's spoken by citizens of the South American countries of Bolivia, Paraguay, and Suriname.
French Guyana
French Guiana is the only country in South America that speaks French.
French Guiana, formerly a colony and now an overseas department of France.
In Belgium, Dutch is spoken in the north and French in the south.
Portuguese is the official language of Brazil.
Portuguese is spoken in the South American countries of Argentina and Uruguay. For there's a lot of traffic back and forth over both countries' borders with Brazil. And in both countries, Portuguese is a required subject for schoolchildren. Portuguese also is spoken in the South American country of The Co-operative Republic of Guyana. For it's one of the nine recognized regional languages of importance. But the country's official language remains English. And, to far lesser degrees, Portuguese also is spoken in the South American countries of Bolivia, French Guiana, Paraguay, Suriname, and Venezuela. But the largest South American country in which Portuguese is spoken is the former Portuguese colony of Brazil.
French Guiana
Paramaribo is the South American city where Dutch is spoken. It's the capital and the largest city in the Republic of Suriname. But it isn't the only city where Dutch is spoken in the Republic. In fact, Dutch is spoken in all of Suriname's cities. It's the country's official language.
French is spoken in several areas of the South Pacific, particularly in the French territories of New Caledonia, French Polynesia, and Wallis and Futuna. Additionally, there may be some French speakers in other countries in the region due to historical ties with France.
Most South American countries speak Spanish. Brazil is the largest country in South America and Portuguese is their primary language. Making them the largest non Spanish language group in South America