Kalimantan (kaliˈmantan) is the Indonesian portion of the island of Borneo. It constitutes 73% of the island's area. The non-Indonesian parts of Borneo are Brunei and East Malaysia. In Indonesia, "Kalimantan" refers to the whole island of Borneo.
In 2019, President of Indonesia Joko Widodo proposed that Indonesia's capital be moved to Kalimantan, and in January 2022 Indonesian legislature approved the proposal. The shift is expected to take up to 10 years.
Most Indonesian refer to The name Kalimantan as derived from the Sanskrit word Kalamanthana, which means "burning weather island", or island with a very hot temperature, referring to its hot and humid tropical climate. It consists of the two words kal[a] ("time, season, period") and manthan[a] ("boiling, churning, burning") because of Indianized culture But the Native people of the Indonesian Borneo referred to their island as Pulu K'lemantan or "Kalimantan" when the sixteenth century Portuguese explorer Jorge de Menezes made contact with them. Its association with the island and its people has also been attributed to British scientist and colonial administrator Charles Hose from the early 20th century.
The Indonesian territory makes up 73% of the island by area, and 72.1% of its 2020 population of 23,053,723 (the population was 13,772,543 at the 2010 Census of Indonesia, and 16,625,796 at the 2020 Census). The non-Indonesian parts of Borneo are of Brunei (460,345 in 2020) and East Malaysia (5,967,582 in 2020), the latter comprising the states of Sabah (3,418,785) and Sarawak (2,453,677), and the federal territory of Labuan (95,120). The region within Indonesia is also known as Indonesian Borneo.
Kalimantan's total area is .
The widespread deforestation and other environmental destruction in Kalimantan and other parts of Indonesia has often been described by academics as an ecocide.
Kalimantan is now divided into five provinces.