Sundaland
This includes Sumatra, Java, Borneo and the smaller surrounding islands, share similar characteristics with Asian fauna. During the ice age, after the Laurasia break up, the main Asian continent was connected with the Indonesian archipelago. Moreover, a low sea level enabled animals from the Asian mainland to migrate to Sundaland. As a result, large species such as tiger, rhinoceros, orangutan, elephant, and leopard exist in this region, although some species are categorised as endangered species. The Makassar Strait, between Borneo and Sulawesi, and the Lombok Strait, between Bali and Lombok, which is the Wallace Line separator, mark the end of the Sundaland region.
Read more about this topic: Fauna Of Indonesia