
The Oyapock or Oiapoque River (k or i:; Fleuve Oyapock flœv wɑjapɔk; Rio Oiapoque ˈʁiu ɔjɐˈpɔki) is a 370-km (230-mi)–long river in South America that forms most of the border between French Guiana and the Brazilian state of Amapá. It rises in the Tumuk Humak (Tumucumaque) mountain range and flows into the Atlantic Ocean, where its est...
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http://en.wikipedia.org/wiki/Oyapock

The Oyapock was a British-built Brazilian river gunboat of 195 tons displacement launched in 1907. The Oyapock had a top speed of 14 knots and carried a complement of 51. She was armed with two 3-pdr guns and two machine-guns.
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http://www.probertencyclopaedia.com/browse/RO.HTM
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