Wikipedia
Oiapoque (Oyapock) is a municipality in the north of the state of Amapá, Brazil. Its population is 20,226 and its area is . Oiapoque is also a major river in the same state, forming the international border with French Guiana. The Oyapock River Bridge, connecting the village with Saint-Georges in French Guiana, was constructed but not opened to pedestrian or vehicle traffic.
Lying on the northern coast of Brazil, Oiapoque is popularly considered the northernmost point of Brazil. The phrase "do Oiapoque ao Chuí" (from Oiapoque to Chuí) means "all of Brazil." However, there are more northerly points in Roraima state such as the municipality of Uiramutã. Oiapoque remains the northernmost coastal city of Brazil, and the northernmost city of Amapá. It occupies more than half of the north border of the state.