The Brazil–France border is the line, located in the Amazon Rainforest, that limits the territories of Brazil and France.

[1] The Oyapock River defines part of the border and is spanned by the Oyapock River Bridge, the only bridge crossing the border, which connects the towns of Saint-Georges (French Guiana) and Oiapoque (Brazil).

[4] The dispute went on for two centuries as France and Brazil set up military posts and religious missions in what would spark the Amapá Question, an event which saw French troops invade Brazilian territory up to the Araguari river occupying approximately 260,000 km2 (100,000 sq mi) of Brazilian territory.

[4] The territorial dispute was resolved in Brazil's favor in 1900 through an international arbitration in Switzerland.

[5] As a cultural vestige of this period, small Amerindian communities still exist today in Amapá that speak Lanc-Patuá, a French-based Guyanese Creole.