A tiny oil-rich sultanate on the island of Borneo. Officially the State of Brunei Darussalam or the Nation of Brunei, the Abode of Peace. Brunei has the second highest Human Development Index among the South East Asian countries after Singapore, and is classified as a Developed Country. According to the International Monetary Fund (IMF), Brunei is ranked 4th in the world by gross domestic product per capita at purchasing power parity.