Brunei Darussalam is 2,226 square miles (5,763 square kilometers), with a coastline of about 100 miles (161 kilometers) on the South China Sea coast of northwestern Borneo and along the western shores of the southernmost portion of Brunei Bay. Brunei is completely surrounded by the Malaysian state of Sarawak. The climate is equatorial with high temperatures, high humidity, and heavy rainfall, although there is no distinct wet season. The country is divided into three contiguous administrative districts—Brunei-Muara, Tutong, and Belait—with a fourth, Temburong, separated by the Limbang Valley of Sarawak. The names of the districts derive from their main rivers.
Approximately 75 percent of the country is forested, although the exportation of whole logs has been banned. The country is covered with a wide range of mangrove, heath, peat swamp, mixed dipterocarp, and montane forests. There are numerous rivers, whose broad valleys contain most of the country's settlements. The southern portion of Temburong is mountainous and sparsely populated.
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