Indonesia officially the Republic of Indonesia is a country in Southeast Asia and Oceania. Indonesia comprises17,508 islands. With a population of around 238 million people, it is the world's fourth most populouscountry, and has the world's largest population of Muslims. Indonesia is a republic, with an elected legislature and president. The nation's capital city is Jakarta. The country shares land borders withPapua New Guinea, East Timor, and Malaysia. Other neighboring countries include Singapore,Philippines, Australia, and the Indian territory of the Andaman and Nicobar Islands. Indonesia is a founding member of ASEAN and a member of the G-20 major economies.