Covering an area of roughly 287,000 square miles, Borneo is the third-largest island in the world. It is divided into four political regions: Kalimantan belongs to Indonesia; Sabah and Sarawak are part of Malaysia; a small remaining region comprises the sultanate of Brunei. Located southeast of the Malay Peninsula and southwest of the Philippines, Borneo is primarily mountainous, with dense areas of rain forest.
Given the abundance of rainfall, it makes sense that Borneo's flora is among the most diverse in the world. Borneo has nearly 11,000 species of flowering plants, about a third of which are indigenous. How dense is the vegetation? In one 16 acre area of Borneo's lowland forest, over 700 species of trees have been recorded. In comparison, there are only 171 native tree species in all of eastern North America.
