Indonesia has a well-preserved, natural ecosystem, such as rainforests that stretch over about 57% of Indonesia's land (225 million acres) and about 2% of them are mangrove. One reason why the natural ecosystem in Indonesia is still well-preserved is because only 6,000 islands out of 17,000 are permanently inhabited. Forests on Sumatra and Java are examples of popular tourist destinations. Moreover, Indonesia has one of longest coastlines in the world, measuring 54,716 kilometres (33,999 mi), with a number of beaches and island resorts, such as those in southern Bali, Lombok, Bintan and Nias Island. However, most of the well-preserved beaches are those in more isolated and less developed areas, such as Karimunjawa, the Togian Islands, and the Banda Islands.
