Borneo is the third largest non-continental island in the world (after Greenland and New Guinea). It is located in Southeast Asia and is divided into three parts, administered by separate countries:
| Brunei a sovereign country occupying two small portions of the northwestern coast |
| East Malaysia (Sabah, Sarawak,) the Malaysian part, occupying the northern third of the island |
| Kalimantan (Central, East, South, West) the Indonesian part, occupying the central and southern regions |