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
Suriname (Kingdom of the Netherlands) the constituent country have always been officially known as Surinam or Suriname, in both Dutch and English, the colony was often unofficially and semi-officially referred to as Dutch Guiana (Dutch: "Nederlands Guiana") in the 19th and 20th century, in an analogy to British Guiana and French Guiana. Using this term for Suriname is problematic, however, as historically Suriname was only one of many Dutch colonies in the Guianas, others being Berbice, Essequibo, Demerara, and Pomeroon, which after being taken over by the United Kingdom in 1814 were united into British Guiana in 1831. Before 1814, the term Dutch Guiana did