Why the world's third-largest island is known by two different names
In short: Borneo is a massive, equatorial landmass shared by three nations, yet Indonesians refer to the entire island as Kalimantan. Derived from Sanskrit, the name implies a burning, hot climate. While the world knows it as Borneo, understanding the local perspective reveals a complex history of geography, politics, and ecology.
Borneo, the third-largest island globally, sits in the southwestern Pacific, bounded by the South China, Sulu, Celebes, and Java seas. While the name Borneo is standard in English—originating from European contact with the Bruneian Sultanate during the Age of Exploration—Indonesians use the term Kalimantan for the entire island. Politically, the island is divided: the Malaysian states of Sabah and Sarawak and the sultanate of Brunei occupy the north, while the southern three-fourths, known as Kalimantan, belong to Indonesia.
The island’s geography is defined by a central mountainous spine, including the Crocker, Nieuwenhuis, and Muller ranges, which culminate in Mount Kinabalu at 13,455 feet. These highlands feed a network of navigable rivers like the Kapuas and Mahakam, which have historically served as the primary lifelines for trade. The climate is intensely equatorial, with an average annual rainfall of about 150 inches, supporting dense rainforests and unique biodiversity, including the Rafflesia arnoldii, the world's largest flower, and endemic species like the Bornean clouded leopard and the proboscis monkey.
Human habitation on the island is sparse by Asian standards, with a diverse population including Dayaks, Malays, and Chinese. Economically, the region has historically relied on small-scale extraction of gold, diamonds, and minerals, alongside oil fields on the continental shelf. Recent decades have seen significant environmental shifts, with academics describing widespread deforestation as ecocide. Meanwhile, the political landscape continues to evolve; in 2019, Indonesia proposed moving its capital to a planned city named Nusantara, to be carved out of East Kalimantan, reflecting the island's growing central importance in the nation's future.
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Sources
- Summary by Intellect · source: Kalimantan | Indonesia, Island, Map, & Facts | Britannica
- Also: Kalimantan
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