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
Dutch name "Jeanne"). (See also Sjors & Sjimmie.) Working-class names Jan, Piet and Klaas (the Dutch proverbial equivalent to "Tom, Dick and Harry") were often replaced by middle-class Hans, Peter and Nico. Also, the urge to name children after their grandparents lessened dramatically. The change in naming also led to a new law on naming in 1970, replacing the old one, which had been in force since 1803. Nowadays, traditional official names are found, but often only as an addition to the modern name. Boys are more often given a traditional Dutch name than girls. Boys are also more commonly named after