Indonesia is a transcontinental unitary sovereign state located mainly in Southeast Asia, with some territories in Oceania.

Situated between the Indian and Pacific oceans, it is the world's largest island country, with more than thirteen thousand islands. At 1,904,569 square kilometres (735,358 square miles), Indonesia is the world's 14th largest country in terms of land area and the 7th largest in terms of combined sea and land area.

With over 261 million people, it is the world's 4th most populous country as well as the most populous Austronesian and Muslim-majority country. Java, the world's most populous island, contains more than half of the country's population.

Indonesia's republican form of government includes an elected parliament and president.

Its capital is Jakarta, which is the second most populous urban area in the world.

Despite its large population and densely populated regions, Indonesia has vast areas of wilderness that support a high level of biodiversity. The country has abundant natural resources like oil and natural gas, tin, copper and gold. Agriculture mainly produces rice, palm oil, tea, coffee, cacao, medicinal plants, spices and rubber. 

Indonesia secured its independence after World War II.

Indonesia consists of hundreds of distinct native ethnic and linguistic groups, with the largest—and politically dominant—ethnic group being the Javanese.

Indonesia's economy is the world's 16th largest by nominal GDP and the 7th largest by GDP at PPP.