Nature is the primary attraction of Sumatra. There are jungles, volcanoes and lakes. The rain-forest of this island is so important that in 2006 no less than 25,000 square km was declared a UNESCO World Heritage Site and named The Tropical Rainforest Heritage of Sumatra. This area comprises three distinct national parks, the Gunung Leuser National Park, Kerinci Seblat National Park and Bukit Barisan Selatan National Park. Perhaps the most notable specific attraction is the endemic Sumatran Orangutan (smaller and rarer than the only other species of orangutan which is endemic to Borneo). These are restricted to the northern parts of the island and perhaps the easiest place to see them is at Bukit Lawang in the Gunung Leuser National Park. Wink Travel Guides introduce you to the best world travel destinations, in a clear and concise way, illustrated by photos.