- an island in the Malay Archipelago, politically divided among Indonesia, Malaysia, and the British-protected sultanate of Brunei. 290,000 sq. mi. (750,000 sq. km).
- 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)
