Heart of the largest continued remnant of the Brazilian Atlantic Forest, the Ribeira Valley is a Natural Heritage of Humanity, granted heritage as a Biosphere Reserve by UNESCO. One of the biggest attractions is the biologic and ecosystems diversity, where approximately 400 species of birds, amphibians, reptiles and mammals live. The Alto Ribeira Tourist State Park (PETAR) is paradise for ecotourists, for its enormous diversity in geologic formations, among grottos and caves, rivers and waterfalls. There are currently 454 caves registered by the Brazilian Society of Speleology (SBE) in the State of São Paulo, all at the Ribeira Valley. The 280 caves located at PETAR represent the biggest concentration of caves in Brazil.