Republic of Indonesia abbreviated RI or Indonesia is a country in Southeast Asia, the crossed the equator and lies between Asia and Australia as well as between the Pacific and Indian Ocean. Indonesia is an archipelagic country largest in the world which consists of 17,508 islands, therefore it is also known as the Nusantara (Island of). With a population of 222 million people in In 2006, Indonesia is the fourth most populous country in the world and most populous Muslim country in the world, although not officially Islamic state.