Geography of Brunei: Landscapes and Natural Riches

Published on August 1, 2026 and written by Cyril Jarnias

Brunei, officially known as Negara Brunei Darussalam, is a small country in Southeast Asia that holds many natural riches. Let’s dive into the fascinating geography of this prosperous sultanate, exploring its location, main regions and cities, as well as its neighboring countries.

Strategic Location on the Island of Borneo

Brunei is located on the northern coast of the island of Borneo, the third-largest island in the world after Greenland and New Guinea. More specifically, the country is positioned between coordinates 4°30′ North and 114°40′ East. This geographic position provides direct access to the South China Sea, a strategic maritime route for international trade.

With a total area of 5,765 km², Brunei is a relatively small country, comparable in size to the French department of Lozère. However, its unique geographic location makes it a significant player in the region.

A Varied Topography Between Coastal Plains and Mountains

Brunei’s terrain is characterized by surprising diversity for such a small territory:

• A flat, low-lying coastal plain in the north, bordering the South China Sea
• Hills and low-lying rolling lands in the west
• Mountains rising gradually in the east

The country’s highest point is Bukit Pagon, located on the border with Malaysia, which rises to 1,850 meters above sea level. This topographic diversity contributes to the richness of Brunei’s ecosystems, with lush tropical forests covering approximately 75% of the territory.

The Main Administrative Regions

Brunei is divided into four administrative districts, called “daerah” in Malay:

• Brunei-Muara: the most populous district, home to the capital
• Belait: western region rich in oil resources
• Tutong: central district known for its beaches and rural areas
• Temburong: eastern exclave separated from the rest of the country, famous for its national park

A geographic peculiarity of Brunei is that its territory is divided into two non-contiguous parts. The Temburong district is indeed separated from the rest of the country by a portion of the Malaysian state of Sarawak, making Brunei a nearly landlocked state.

Bandar Seri Begawan: Capital and Largest City

Brunei’s capital and largest city is Bandar Seri Begawan, located in the Brunei-Muara district. With a population of approximately 100,700 residents, it concentrates nearly a quarter of the country’s total population.

Bandar Seri Begawan is Brunei’s political, economic, and cultural center. It notably houses:

• Istana Nurul Iman Palace, the Sultan’s official residence and the largest occupied palace in the world
• Omar Ali Saifuddien Mosque, an iconic architectural symbol of the country
• The floating village of Kampong Ayer, nicknamed the “Venice of the East”

Other Major Cities in Brunei

Although Brunei is a small country, it has several other notable cities:

• Kuala Belait: the country’s second-largest city, center of the oil industry
• Seria: an important oil town in the Belait district
• Tutong: capital of the district of the same name, known for its beaches
• Bangar: main town of the Temburong district

These cities, though smaller than the capital, play a crucial role in the country’s economy and development.

A Limited but Strategic Neighborhood

Brunei shares land borders with only one country: Malaysia. More specifically, it is surrounded by the Malaysian state of Sarawak, which is part of East Malaysia on the island of Borneo.

The border between Brunei and Malaysia stretches for 381 kilometers. This geographic proximity has naturally led to close ties between the two countries, although territorial disputes persist, particularly concerning the Limbang region.

Beyond its land borders, Brunei maintains important maritime relations with:

• Indonesia: which controls the southern part of the island of Borneo (Kalimantan)
• The Philippines: located to the northeast, across the Sulu Sea

An Equatorial Climate Conducive to Lush Biodiversity

Brunei enjoys an equatorial climate characterized by:

• Warm, stable temperatures year-round (averaging between 23°C and 32°C)
• High humidity (around 80%)
• Abundant rainfall (approximately 2,900 mm per year on the coast)

This climate, combined with the country’s topographic diversity, fosters the development of varied ecosystems, ranging from coastal mangroves to mountain rainforests.

Brunei’s natural wealth is especially evident in Ulu Temburong National Park, nicknamed the “Green Heart of Borneo,” which hosts exceptional biodiversity, including iconic species such as the Bornean orangutan.

In conclusion, Brunei’s geography, though compact, is remarkably diverse and strategic. Its position on the island of Borneo, abundant natural resources, and exceptional biodiversity make it a unique country in Southeast Asia. Preserving this natural heritage, alongside economic development based on hydrocarbons, represents a major challenge for the sultanate’s future.