Cuba, the largest island in the Caribbean, has 7 national parks. The wetlands of Montemar National Park teem with life and you can see flamingos, manatee, crocodiles and the world’s smallest bird, the bee hummingbird. In the imposing mountains of the Sierra Maestra National Park, which contain Cuba's highest peak, there is a spectacular variety of flora and fauna, including a great diversity of colourful birdlife. Another mountainous ecosystem is found in the Alejandro de Humboldt National Park, a gem of tropical island biodiversity. National Park Viñales, a UNESCO World Cultural and Landscape Site, is a picturesque valley of farms and villages set against characteristic limestone cliffs which rise like islands from the bottom of the valley. Hiking and rock climbing are very popular activities here.