Chuí Stream
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The Chuí, or Chuy, Stream, is a short stream on the Brazil–Uruguay border that is Brazil's southernmost point.
International bridge near the mouth, seen from the Brazilian side.
The exact southernmost point of Brazil, seen from the Uruguayan side.
Oyapock
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The Oyapock or Oiapoque is a 403-kilometre (250 mi) long river in South America that forms most of the border between the French overseas department of French Guiana and the Brazilian state of Amapá.
View of the Oyapock River from Brazil toward French Guiana