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 ( [ ɪndəˈniːʒə ] or [ ˌɪndoʊˈniːziə ] ; Indonesian : [ ɪndonesia ] ) , officially the Republic of Indonesia ( [ rɛpublik ɪndonesia ] ) , is a unitary sovereign state and transcontinental country located mainly in Southeast Asia with some territories in Oceania . At 1,904,569 km2 , Indonesia is the world 's 14th-largest country in terms of land area and world 's 7th-largest country in terms of combined sea and land area . Other neighbouring countries include Singapore , Vietnam , the Philippines , Australia , Palau , and the Indian territory of the Andaman and Nicobar Islands .