unesco world heritage sites
Borobudur in Central Java is the world's largest Buddhist monument, dating from the 8th century and nearby Prambanan, close to Borobudur, is a remarkable Hindu monument dating from just a few years later.
Indonesia has some of the largest remaining tracts of tropical forest anywhere in the world, and these support any incredibly diverse wildlife from Orang Utangs and other primates to critically endangered Javan Rhinoceros and Tigers, and an extraordinarily wide range of bird species. Areas recognised as world heritage sites are Ujung Kulon National Park in West Java and huge parts of Sumatra including Gunung Leuser National Park and Kerinci Seblat National Park.
Further east Komodo Island is the home of the remarkable Komodo Dragon and the very remote Lorentz National Park in Papua has a permanent glacier.
geography
Indonesia is home to no less than 167 active volcanoes, far more than any other country. Some of the more accessible for visitors are in the Bromo-Tengger-Semeru National Park and the Ijen Crater in East Java, Mount Rinjani in Lombok and perhaps easiest of all, Mount Batur in Bali.
Hardly surprisingly in the world's largest archipelago, beaches are significant attractions.