The Pointe Béhague or Pointe Coumarouman or even Ponta de Cumarumã (in Portuguese) is a cape in north-east French Guiana, lying between the mouths of Approuague and Oiapoque rivers.
In 1992, it was chosen for location of the fictitious city (and nation) of Porto Claro.
References
Pointe Béhague Wikipedia(Text) CC BY-SA