While occupying only three per cent of the earth’s surface, the ASEAN region boasts of globally signi cant terrestrial and marine biodiversity that include an astonishing 18 per cent of all species assessed by the International Union for Conservation of Nature (IUCN). It has the most diverse coral reefs in the world and is home to the mega-diverse countries of Indonesia, Malaysia and the Philippines. The region also spans several unique bio-geographical units such as Indo-Burma, Malesia, Sundaland, Wallacea and the Central Pacific.