Indonesia is the largest archipelagic country in the world, comprising around 17,000 islands. Its population counts to 261 million, making it the fourth most populous nation in the world. Indonesia has the highest GDP in the ASEAN region with USD 1 trillion in 2017 and it is the only ASEAN member who is part of the G-20. However, in terms of its GDP per capita, in 2017 it is amounted to USD 3,871 and it takes the fifth place among the Southeast Asian countries. Indonesia is a presidential constitutional democracy, in which the political power is to a considerable extent decentralized to provincial and local governments. Jakarta is the capital city of Indonesia and the largest metropolitan area in Southeast Asia with tremendous population growth and a wide range of urban issues. Bahasa Indonesia is the official language and spoken throughout the country, while English is commonly used as the business language.
 2016 estimation by Bank Indonesia
 ASEAN Secretariat. ASEAN Statistical Leaflet 2018