The Great Indonesia consists of 17,508 islands. It is the world’s 15th-largest country in terms of land area (1,919,440 square kilometres) and world’s 7th-largest country in terms of combined sea and land area. Its average population density is 134 people per square kilometre, 79th in the world, although Java, the world’s most populous island has a population density of 940 people per square kilometre.
Puncak Jaya in Papua is Indonesia’s highest peak (4,884 metres) and Lake Toba in Sumatra is largest lake (1,145 square kilometres). Indonesia’s location on the edges of the Pacific, Eurasian, and Australian tectonic plates makes it the site of numerous volcanoes and frequent earthquakes. Indonesia has at least 150 active volcanoes, including Krakatoa and Tambora, both famous for their devastating eruptions in the 19th century. The eruption of the Toba supervolcano, approximately 70,000 years ago, was one of the largest eruptions ever, and a global catastrophe. However, volcanic ash is a major contributor to the high agricultural fertility that has historically sustained the high population densities of Java and Bali.
Indonesia is a founding member of ASEAN, the Non-Aligned Movement (NAM), the Organisation of the Islamic Conference (OIC, now the Organisation of Islamic Cooperation) and a member of the G-20 major economies. The Indonesian economy is the world’s 16th largest by nominal GDP (the largest economy in Southeast Asia). According to World Trade Organization data, Indonesia was the 27th biggest exporting country in the world in 2010. The Indonesian archipelago has been an important trade region since at least the 7th century, when Srivijaya and then later Majapahit traded with China and India.
Indonesia consists of hundreds of distinct native ethnic and linguistic groups. The largest – and politically dominant – ethnic group are the Javanese within a majority Muslim population. Indonesia’s national motto, “Bhinneka Tunggal Ika” (“Unity in Diversity” literally, “many, yet one”), articulates the diversity that shapes the country. Despite its large population and densely populated regions, Indonesia has vast areas of wilderness that support the world’s second highest level of biodiversity after Brazil.
source : Wikipedia