The isthmus of Panama is a prolific biological corridor between North and South America. The Guna Yala Nation, (also known as San Blas), is located along Panama's northeast Caribbean coast. Guna Yala is one of Panama’s five indigenous territories and encompasses an archipelago of nearly 400 islands. The Guna have succeeded in keeping their islands undisturbed by western tourism development and retain a strong culture. With its astonishing biological diversity, the region has been the subject of numerous scientific studies, many of which suggest that Guna Yala has the highest diversity of coral species as well as the best reef development in Panama. Consequently, the marine life throughout is superb, with tropical fish, dolphins, sea turtles, rays and possibly dugongs. Vast undisturbed forests cover much of the Panamanian isthmus and 100 land mammal species (including the 200 kg endangered spectacled bear), 30 reptile species and 440 bird species inhabit the area.