This is a list of some of the Regions of Indonesia. Many regions are defined in law or regulations by the central government. At different times of Indonesia's history, the nation has been designated as having regions that do not necessarily correlate to the current administrative or physical geography of the territory of the nation.
According to ISO 3166-2:ID, Indonesia is divided into 7 geographical units, with each unit consisting of major islands or an island group. These geographical units are as follows:
|ID-JW||Java||Banten, Jakarta, West Java, Central Java, S.R. Yogyakarta, East Java|
|ID-KA||Kalimantan||West Kalimantan, Central Kalimantan, North Kalimantan, East Kalimantan, South Kalimantan|
|ID-ML||Maluku Islands||North Maluku, Province of Maluku|
|ID-NU||Lesser Sunda Islands||Bali, West Nusa Tenggara, East Nusa Tenggara|
|ID-PP||Western New Guinea||West Papua, Province of Papua|
|ID-SL||Sulawesi||North Sulawesi, Gorontalo, Central Sulawesi, West Sulawesi, South Sulawesi, Southeast Sulawesi|
|ID-SM||Sumatra||Aceh, North Sumatra, West Sumatra, Riau, Riau Islands, Jambi, Bengkulu, South Sumatra, Bangka Belitung Islands, Lampung|
During the last stages of the Dutch colonial era, the area east of java and Kalimantan was known as the Great East and later known as East or Eastern Indonesia. On 24 December 1946, the State of East Indonesia was formed covering the same area (but also including [[ Western New Guinea]]). It was a component of the United States of Indonesia, and was dissolved into the unitary Republic of Indonesia in August 1950.