Belait District (; Jawi: داءيره بلاءيت) or simply known as Belait (; ), is the largest as well as the westernmost district in Brunei. It has an area of and the population of 65,531 as of 2021. The administrative town is Kuala Belait, located at the mouth of the long Belait River. The district is commonly associated with the oil and gas industry of the country, mainly concentrated near the town of Seria.

Geography The South China Sea borders Belait District to the north, Tutong District to the northeast, and Sarawak, Malaysia to the west and south. The district's lowlands are steep and below an elevation of . Areas along the shore, which are mostly characterised by marshy plains with slender alluvial valleys that extend to the major rivers, are the exception. Bukit Teraja, the district's highest point, stands at 417 meters.

With multiple offshore installations and pipeline connections, the district is situated on the northwest coast of Borneo, is a vital hub for the nation's oil and gas sector. The Belait River, the longest river in the nation's four major river systems, has an impact on the district's coastal waters as it empties into the South China Sea. The presence of oil and gas infrastructure, which are encircled by a buffer zone of one nautical mile prohibiting fishing, limits the area's fishing opportunities in both shallow and deeper seas. The district covers . There are a few known groundwater reserves in the Sungai Liang and Seria regions.

As of 1992, 18,418 hectares of Brunei's mangrove forests were being modestly exploited for firewood, charcoal, and commercially for building poles, with Belait District contributing 3% (). Ceriops tagal was cultivated only in Belait, while Rhizophora apiculata and Nypa fruticans were the most common species in Brunei–Muara, Belait, and Tutong. In Belait, Melastoma malabathricum was the most associated species, and Rhizophora apiculata had the highest regeneration rate with 3,540 seedlings per hectare. The Belait Swamp Forest has been identified by BirdLife International as an Important Bird Area.

History Following numerous similar cessions to Sarawak and the British North Borneo Company, the District of Sarawak was ceded to Sir James Brooke in 1841. As a result, the State of Brunei was reduced to approximately 2,226 square miles, with a pre-1947 population of 40,670 (based on preliminary census figures for 1947). The State was made up a few outlying districts, the most significant of which are Belait, Tutong, and Temburong. Brunei's foreign affairs were taken over by the British government in 1888, and in 1905 the monarchy nominated a British Resident to help with management. The Assistant Resident post was reinstated in response to the oil discoveries in the Belait District in order to handle the region's growing demand.

A British Resident, serving as the high commissioner under the Governor of Sarawak, is in charge of Bruneian government. Advice from the Resident was needed on all issues, with the exception of those pertaining to the Islamic faith. Under the direction of the British Resident, four administrative districts were overseen by Malay district officers. Heads of state departments, including agriculture, public works, and medicine, are European officials on secondment; the Assistant Resident oversees the department of education at the moment. Local sanitation and related issues are overseen by sanitary boards in Brunei Town, Tutong, and Kuala Belait.

Administration Starting at the intersection of Lorong Tengah and Jalan Tengah, the declaration of the 1959 Kuala Belait and Seria (Municipal Board Areas) Declaration, delineates the precise boundaries of the Seria Municipal Board Area. It then proceeds to follow a number of roads and crossroads, culminating in the formation of the municipality's specified boundary. Furthermore, in accordance with the Third Schedule, prior notices concerning these limits are withdrawn. The boundaries of the Kuala Belait and Seria Municipal Board Areas have been redrawn by this decree. The region of Oil Well No. 22 is currently included in the Seria Municipal Board region.

The Kuala Belait Municipal Board Area's limits have been altered by the Sultan-in-Council's 1974 Declaration (Municipal Board Area) Amendment. It delineates the new region on the east bank of the Belait River and supersedes the First Schedule of the 1959 Declaration. The region starts from a position on the Belait River estuary, travels north toward the China Sea, and passes by certain locations, such as the Istana Manggalela and the sewage disposal facility owned by Brunei Shell Petroleum (BSP), before circling back along the Belait River to the beginning point.

The procedures for the board's business conduct are outlined in the Kuala Belait and Seria Municipal Board (Standing Orders) By-Laws, 2014. Meeting procedures, such as notification requirements, quorum requirements, and the responsibilities of the chairman and secretary, are outlined in the bylaws. Members must adhere to certain voting and speaking procedures, and meetings must begin with a prayer. The chairman is in charge of the meeting, and every motion needs to be submitted in writing and seconded before it can be discussed. These bylaws guarantee the Municipal Board's organised and orderly governance.

The district is administered by the Belait District Office (), a government department under the Ministry of Home Affairs. The district is subdivided into 8 mukims, namely: MukimPopulation (2021)Penghulu (2024)Bukit Sawat759Haji Md. Salleh bin Haji OthmanKuala Balai16Kuala Belait28,793Haji Abdul Afiq bin ZainuddinLabi727Muhammad Nurazri bin Haji Abdul MustafahLiang16,813Haji Mohamad Yamin bin Haji Abdul RanniSeria18,313Haji Sadin bin Haji IbrahimMelilas29Mohammad bin Abdullah @ Lim Swee AnnSukang81 These are further subdivided into 83 Kampongs (Villages).

According to the Constitution, the district is to be represented in the Legislative Council, the state legislature, by up to 3 members. As of 2023, two members have been appointed to represent the district in the legislature.

Demographics Malay, Chinese, and other indigenous communities like the Dusun and Murut make up its population. The majority of people live in Seria and the main town of Kuala Belait. Due to homes provided by BSP and the British Forces Brunei, as well as recreational amenities, the Panaga area in the district is home to a significant expat population.

Despite their varied cultural histories and original non-Muslim status, seven indigenous ethnic groups—including the Belait people—were merged into a single Malay identity in 1961 with the passage of the Nationality Act. Consequently, the Belait and other communities are now acknowledged as Malays by the government, adding to Brunei's complex Malay identity. Some notable non-Muslim minorities including the Belait people maintain their historical customs in spite of Islam's supremacy. In 2022, Eid al-Fitr and Adau Gayoh were jointly celebrated in Belait District, which represent the blending of national identity with ancient rituals and promote unity, have become more common in public settings in recent years.

Religion

Islam is the most followed religion in Belait District, with notable Christian and Buddhist minorities. A significant portion of the population also identifies with other or unspecified beliefs.

Transportation

Road

The government has invested approximately B$600 million in the 2007–2012 National Development Plan (RKN) to enhance road networks, including highway projects, paving, maintenance, and resurfacing. Notable projects in Belait under the RKN include upgrading Jalan Tutong–Seria (Lumut) phase 2, Jalan Sungai Mau/Merangking/Buau, high-density roads, and wooden bridge replacements, along with the construction of the Seria By-Pass second lane and widening roads on Jalan Singa Menteri.

The Rasau Bridge connects the district to Sungai Tujoh and Miri in Sarawak, Malaysia to the west, while the Seria/Lumut bypass connects it to the Muara–Tutong Highway to the east. By coastal highways, it takes over an hour to get from Bandar Seri Begawan to Belait District. As of 2022, the district's road network consisted of , out of which were paved.

Rail

Built by the British Malayan Petroleum Company (now BSP) in the 1930s, a narrow gauge railway with a gauge connected Seria to Badas for the transportation of water and subsequently pipeline tubes. Significant portions of the railway were concealed during World War II to keep Japanese soldiers from utilising it. The railway was promptly reactivated to move artillery and ammunition after being freed in July 1945 by the Australian Army's 9th Division. The path between Seria and Badas is now paved, while parts of the track may still exist.

Water

To get upriver towards Kuala Balai, tourists can rent a water taxi at the public dock next to the Kuala Belait market. Additionally, the Kuala Belait Boat Club arranges boat cruises to a number of neighbouring locations. around the past, Rasau had a timber jetty around 1930. One of Brunei's three ports, Kuala Belait Port, features a portion near the river mouth that is administered by BSP and has limited public access. Further upriver in Kampong Sungai Duhon, the commercial port can only handle shallow draft vessels because to silting. At the mouth of the river, two breakwaters have been built to lessen this. The nearest deepwater port in Brunei is Muara Port in Brunei–Muara District.

Air A privately owned airstrip at Anduki is mostly used for flights to BSP facilities located offshore. Travelers must go to the Miri Airport or the Brunei International Airport for commercial flights. Panaga Health Centre, BSP Headquarters, and Suri Seri Begawan Hospital all have helipads. Furthermore, military helicopter operations are supported by a heliport at the Medicina Lines' British Army Jungle Warfare Training School, which is run by No. 230 Squadron RAF.

Economy

Agriculture

In 2022, the Belait District had 1,511.72 hectares of gazetted agricultural development areas, with 1,052.67 hectares allocated to farmers and 269.31 hectares used for stations or other purposes. The district hosts a variety of Agricultural Development Areas (KKP), with a total of 1,511.72 hectares gazetted for agriculture. Of this, 1,052.67 hectares have been allocated to farmers, while 269.31 hectares are used for stations or other purposes. Specific areas include KKP Buau and KKP Kenapol, both dedicated to agriculture stations. KKP Bukit Sawat supports agriculture stations and fruit cultivation, while KKP Sungai Liang is used for fruits and vegetables. KKP Kandol, the largest area, spans 710.00 hectares, with 505.00 hectares for paddy. KKP Labi Lama and KKP Lilas are dedicated to fruits, integrated crops, and miscellaneous farming. KKP Lot Sengkuang A and KKP Merangking focus on paddy cultivation. Additionally, KKP Mumong and KKP Sungai Petai are used for a mix of fruits, vegetables, and livestock activities.

In 2022, the district is the only producer of all local cut flowers. The market was dominated by Orchidaceae, with 48,996 cuts valued at B$41,325, representing 98.6% of the total quantity. Alpinia purpurata, Davallia mariesii, and Heliconia accounted for 0.4%, 0.5%, and 0.1% of the total quantity, respectively. The overall market totalled 49,681 cuts with a retail value of B$41,908.

Oil and gas