* One of Indonesia's conservation forests and the biggest

* One of Indonesia's conservation forests and the biggest pristine forest on Sumatra island * Covering 2.6 million hectares of land * Home to some 6,000 orangutans, 4,000 elephants, 200 tigers and 50 sumatra rhinos, all are protected animals * Dubbed one of the world's lungs and a home to millions of flora species * Has received about 31 million euro (US$39.4 million) in conservation fund from European Union since 1996