an island in the W Pacific, between the Sulu and Java Seas, part of the Malay Archipelago: divided into Kalimantan (Indonesian Borneo), the Malaysian states of Sarawak and Sabah, and the sultanate of Brunei; mountainous and densely forested. Area: about 750 000 sq km (290 000 sq miles)
Borneo in American English
(ˈbɔrniˌoʊ)
large island in the Malay Archipelago, southwest of the Philippines: the S portion ( Kalimantan) is a part of Indonesia; the N portion is composed of the Malaysian states of Sabah & Sarawak, and of Brunei: total area, c. 288,000 sq mi (745,917 sq km)