Indonesia's vast size, tropical climate and archipelagic geography, supports the world's second highest level of biodiversity (after Brazil). 58% of the country is covered by forests and its flora and fauna is a mixture of Asian and Australasian species. Once linked to the Asian mainland, the Greater Sunda Islands (Sumatra, Kalimantan, Java and Bali) have a wealth of Asian fauna. Large species such as the tiger, rhinoceros, orangutan, elephant, and leopard, although once abundant and distributed east as far as Bali, have dwindled drastically in number and distribution.