Indonesia a rich cultural heritage that reflects Indonesia's dynamic history and ethnic diversity. Indonesia has a well-preserved natural ecosystem with rain forests that stretch over about 57% of Indonesia's land (225 million acres). Forests on Sumatra and Kalimantan are examples of popular destinations, such as the Orangutan wildlife reserve. Moreover, Indonesia has one of world's longest coastlines, measuring . The ancient Prambanan and Borobudur temples, Toraja and Bali, with its Hindu festivities, are some of the popular destinations for cultural tourism. Indonesia has 8 UNESCO World Heritage Sites, including the Borobudur Temple Compounds and the Komodo National Park; and a further
Culture of Indonesia cities and large towns there are also many commercial stations. Since 2006, several digital radio stations have been based in Jakarta and Surabaya, using Digital Audio Broadcasting (DAB) and Hybrid HD-Radio. Islam is Indonesia's main religion, with almost 88% of Indonesians declared Muslim according to the 2000 census, making Indonesia the most populous Muslim-majority nation in the world. The remaining population is 9% Christian (of which roughly two-thirds are Protestant with the remainder mainly Catholic, and a large minority Charismatic, 2% Hindu, and 1% Buddhist. The "Pancasila", the statement of two principles which encapsulate the ideology of the Indonesian state,