With a population of over 234 million people, Indonesia is the world's fourth most populous country. It is also the world's largest archipelagic state with more than 17000 islands, 90% of them having not been named yet.
Across its many islands, Indonesia consists of more than 100 distinct ethnic, linguistic, and religious groups. The Javanese are the politically dominant and largest ethnic group and are mostly living around Jakarta, the capital, on the archipelago of Java.
Other places to visit include Bali and if you have some more time, try to make it to Sumatra, with its impressive natural beauty. The smaller islands of Indonesia like Madura, Lombok, Sumbawa and Flores are also worth exploring.