Indonesia travel guide and traveling tips. Here are some recommendations on how to plan your trip, the best places to stay, and where to eat. Indonesia officially theĀ Republic of Indonesia is a country inĀ Southeast Asia, between theĀ IndianĀ andĀ PacificĀ oceans. It is the world's largestĀ island country, with more thanĀ seventeen thousand islands, and at 1,904,569 square kilometres (735,358Ā square miles), the 14th largest by land area and the 7th largest in combined sea and land area. With over 261 million people, it is the world'sĀ 4th most populous countryĀ as well as the most populousĀ Muslim-majority country.