In the early Miocene uplift of the accretionary complex occurred as a result of underthrusting of thinned continental crust in northwest. At the beginning of the Cenozoic Borneo formed a promontory of Sundaland which partly separated from Asian mainland by the proto-South China Sea. Borneo was formed through Mesozoic accretion of microcontinental fragments, ophiolite terranes and island arc crust onto a Paleozoic continental core. InChinese records began to use the term Bo-ni to refer to Borneo. In earlier times, the island was known by other names. Indonesian natives called it Kalimantan which was derived from the Sanskrit word Kalamanthana, meaning 'burning weather island' to describe its hot and humid tropical weather. Internationally it is known as Borneoafter Bruneiderived from European contact with the kingdom in the 16th century during the Age of Exploration. Borneo is home to one of the oldest rainforests in the world. Additionally, the Malaysian federal territory of Labuan is situated on a small island just off the coast of Borneo.ДЄ little more than half of the island is in the Northern Hemisphere including Brunei and the Malaysian portion, while the Indonesian portion spans both the Northern and Southern hemispheres. The island is politically divided among three countries: Malaysia and Brunei in the north, and Indonesia to the south. The island was named after the nation of Brunei.

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