A small Islamic sultanate,
The climate in this hilly and rugged country is determined by the equatorial monsoons, or rain-bearing winds. Rainfall is heavy and is distributed throughout the year. Annual precipitation varies from 100 inches (250 centimeters) in the coastal areas to more than 200 inches (500 centimeters) in parts of the interior. Temperatures average between 76° and 86° F (24° and 30° C). Dense tropical rain forests cover three fourths of the country and are characterized by a variety of hardwood species.
The principal language is Malay, but Chinese and English are widely spoken. Most of the people live near the petroleum fields at Seria and Kuala Belait.
The largest concentration of urban population is in