Regions of Indonesia
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Geographical units
According to ISO 3166-2:ID, Indonesia is divided into seven geographical units, with each unit consisting of major islands or an island group. These geographical units are as follows:
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Eastern Indonesia and Western Indonesia
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 Eastern Indonesia. On 24 December 1946, the State of East Indonesia was formed covering the same area (excluding Western New Guinea). It was a component of the United States of Indonesia, and was dissolved into the unitary Republic of Indonesia in 17 August 1950. Currently, Eastern Indonesia consists of 17 provinces: Bali, East Nusa Tenggara, West Nusa Tenggara, Central Sulawesi, Gorontalo, North Sulawesi, South Sulawesi, Southeast Sulawesi, West Sulawesi, Maluku, North Maluku, Central Papua, Highland Papua, Papua, South Papua, Southwest Papua, and West Papua. Meanwhile, the region comprising the other 21 provinces in Sumatra, Java, and Kalimantan is known as Western Indonesia.
Development regions
According to the National Development Planning Agency, Indonesia is divided into four main development regions, with each being led by the major cities of Medan, Jakarta, Surabaya, and Makassar.

