borneo 338Borneo ( ˈ b ɔːr n i oʊ ) is the third-largest island in the world, with an area of 748,168 km 2 (288,869 sq mi), and population of 23,053,723 (2020 national censuses). [1] [2] [3] Situated at the geographic centre of Maritime SoutheastBorneo. The island of Borneo is one of the largest islands in Southeast Asia.In fact, it is the third largest island in the world. Borneo has the distinction of being the only island