Borneo is the third largest island in the world. It has an area of 743,330 km² (287,000 square miles), and is located at the centre of the Malay archipelago and Indonesia. Borneo is considered to be part of the geographic region of Southeast Asia.
Administratively, this island is divided between Indonesia, Malaysia and Brunei.
Borneo is a Western reference; The term was used as by the Dutch during the colonial period. In Indonesia today, the island is referred to as Kalimantan. East Malaysia or Malaysian Borneo refers to the States of Sabah and Sarawak.
Borneo is surrounded by the South China Sea to the north and northwest, the Sulu Sea to the northeast, the Celebes Sea and the Makassar Strait to the east, and the Java Sea and Karimata Strait to the south.
To the west of Borneo are the Malay Peninsula and Sumatra. To the south is Java. To the east is the island of Sulawesi (Celebes). To the northeast is the Philippines.
Borneo's highest point is Mount Kinabalu in Sabah, Malaysia, with an elevation of 4,095 m (13,435 ft) above sea level. This makes it the world's third highest island.
The largest river systems are the Kapuas River, with approximately 1,143 km the longest river in Indonesia, the Rajang River in Sarawak with some 563 km the longest river in Malaysia, the Barito River about 880 km long and the Mahakam River about 980 km long.
Borneo is also known for its extensive cave systems. Clearwater cave has one of the world's longest underwater rivers. Deer cave, thought to be the largest cave passage in the world, is home to over 3 million bats, and has a pile of guano over 100 meters high.
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