Indonesia isn't a country.
The East Asia Summit ( EAS ) is a forum held annually by leaders of , initially , 16 countries in the East Asian , Southeast Asian and South Asian regions . Indonesia . It has an estimated population of over 260 million people and is the world 's fourth most populous country , the most populous Austronesian nation , as well as the most populous Muslim-majority country . The country shares land borders with Papua New Guinea , East Timor , and the eastern part of Malaysia .