Indonesia is a place.
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 . Its capital and country 's most populous city is Jakarta , which is also the most populous city in Southeast Asia and the second in Asia . Other neighbouring countries include Singapore , Vietnam , the Philippines , Australia , Palau , and the Indian territory of the Andaman and Nicobar Islands .