Raleigh falls - Voltzberg, situated at the upper Coppename River, one of the last big uninhabited and unspoiled rivers on earth, is part of the 1.6 million hectare Central Suriname Nature Reserve, one of UNESCO's World Heritage Sites.
In this reserve, also known as Raleighvallen, all eight monkey species of Suriname can be found. The black spider monkey can often be seen during the trip to the Voltzberg Mountain. For some years an international scientific research is going on for some of the monkey species that live here.