Why Borneo
Borneo is the third-largest island in the world, situated at the geographic center of Maritime Southeast Asia and crossed by the equator. Bounded by the South China, Sulu, Celebes, and Java Seas, the island lies near Sumatra, Java, and Sulawesi. Politically, the territory is shared by three countries: Indonesia, which occupies approximately 73 percent across five provinces known as Kalimantan; Malaysia, which holds about 26 percent in the north; and the nation of Brunei on the northwestern shore. The majority of the population lives in coastal urban areas, and the island is also the designated location for Nusantara, Indonesia's planned future capital.
Human habitation on the island extends back tens of thousands of years, supported by archaeological evidence from locations like Samang Buat Cave. Borneo is home to hundreds of Indigenous communities, cultures, and languages, many of which are broadly recognized as Dayak. Maritime trading networks linked coastal settlements to regional routes by the first millennium CE, paving the way for powerful historical states such as the Sultanate of Brunei and the Sultanate of Sulu. In contrast, the island's interior historically maintained a diverse landscape governed by local Indigenous authority systems.
Geographically, the island features dramatic relief, massive river systems, and extensive underground caverns. Mount Kinabalu stands as the highest elevation, while prominent rivers like the Kapuas, Barito, and Mahakam flow through the vast terrain. Karst regions such as Gunung Mulu National Park and the Sangkulirang-Mangkalihat Karst contain thousands of caves. Among these are Deer Cave, home to millions of bats, Clearwater Cave, which features a long underground river system, and the Gomantong Caves.
Borneo encompasses seven distinct ecoregions, including some of the world's oldest tropical rainforests, coastal peat swamps, heath forests, and high-altitude alpine meadows. These ancient environments foster exceptional biodiversity, serving as a vital habitat for thousands of plant species and rare wildlife. Notable species inhabiting the island include the endangered Bornean orangutan, the Borneo elephant, the eastern Sumatran rhinoceros, and the Bornean clouded leopard, along with hundreds of resident bird and freshwater fish species.
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