The official language of Indonesia is Indonesian. It is similar to Malay, and in fact, Indonesian and Malay are mutually intelligible. In addition to Indonesia, many other languages are spoken in the country.
Javanese has many speakers, and most of them are on the island of Java. Sundanese also has many speakers, and many of them are found in the western part of Java. Madurese is primarily spoken on the island of Madura. In western Sumatra, there are many speakers of Minangkabau. Two other prominent languages are Balinese and Acehnese.
Though most Indonesians can speak Indonesian, many other languages are spoken in the country. After Indonesian, the most widely-spoken languages of Indonesia are Javanese and Sundanese. Indonesia is a country of great linguistic diversity.
