Guiana Shield is equally rich and 13,367 species of vascular plants have been found, approximately 40% of which is considered endemic. The shield is overlain by the largest expanse of tropical forest on any Precambrian shield area in the world. Guianan rain forest is similar in nature to Amazonian rain forest and known protected areas include the Iwokrama Forest of central Guyana, Kaieteur, Kanuku National Park of southern Guyana, the UNESCO World Heritage Site Central Suriname Nature Reserve of Suriname, the Guiana Amazonian Park in French Guiana and the Tumucumaque National Park in the Amapá State of Brazil. In Venezuela the forests
Oyapock River Bridge and indeed it is the first terrestrial crossing between French Guiana and of its neighbors in northern South America. Currently, there is a good ferry that crosses the Maroni River between French Guyana and Suriname that links Albina, in Suriname, with Saint-Laurent-du-Maroni in French Guyana. It is also possible to travel from Albina to Georgetown (Guyana) by highway; it is planned to build a bridge between Suriname and Guyana, replacing the current ferry. Onwards to Venezuela, one can only travel by sea, but a road link is planned. In this case, it will be possible to drive from Macapá to