Japanese occupation of British Borneo in the context of "Raj of Sarawak"

Sarawak (/səˈrɑːwɒk/ sə-RAH-wok, Malay: [saˈrawaʔ]) is a state of Malaysia. It is the largest among the 13 states, with an area almost equal to that of Peninsular Malaysia. Sarawak is located in East Malaysia in northwest Borneo, and is bordered by the Malaysian state of Sabah to the northeast, Kalimantan (the Indonesian portion of Borneo) to the south, and Brunei in the north. The state capital, Kuching, is the largest city in Sarawak, the economic centre of the state, and the seat of the Sarawak state government. Other cities and towns in Sarawak include Miri, Sibu, and Bintulu. As of 2020 Malaysia census, the population of Sarawak was 2.453 million. Sarawak has an equatorial climate with tropical rainforests and abundant animal and plant species. It has several prominent cave systems at Gunung Mulu National Park. Rajang River is the longest river in Malaysia; Bakun Dam, one of the largest dams in Southeast Asia, is located on one of its tributaries, the Balui River. Mount Murud is the highest point in the state. Sarawak is the only state of Malaysia with a Christian majority.

The earliest known human settlement in Sarawak at the Niah Caves dates back 40,000 years. A series of Chinese ceramics dated from the 8th to 13th century AD was uncovered at the archaeological site of Santubong. The coastal regions of Sarawak came under the influence of the Bruneian Empire in the 16th century. In 1839, James Brooke, a British explorer, arrived in Sarawak. He, and his descendants, governed the state from 1841 to 1946. During World War II, it was occupied by the Japanese for three years. After the war, the last White Rajah, Charles Vyner Brooke, ceded Sarawak to Britain, and in 1946 it became a British Crown Colony. On 22 July 1963, Sarawak was granted self-government by the British and subsequently became one of the founding members of Malaysia, established on 16 September 1963. However, the federation was opposed by Indonesia, leading to a three-year confrontation. The creation of Malaysia also prompted a communist insurgency that lasted until 1990.

Sabah (Malay pronunciation: [ˈsabah]) is a state of Malaysia located in northern Borneo, in the region of East Malaysia. Sabah has land borders with the Malaysian state of Sarawak to the southwest and Indonesia's North Kalimantan province to the south. The Federal Territory of Labuan is an island just off Sabah's west coast. Sabah shares maritime borders with Vietnam to the west and the Philippines to the north and east. Kota Kinabalu is the state capital and the economic centre of the state, and the seat of the Sabah State government. Other major towns in Sabah include Sandakan and Tawau. The 2020 census recorded a population of 3,418,785 in the state. It has an equatorial climate with tropical rainforests, abundant with animal and plant species. The state has long mountain ranges on the west side which forms part of the Crocker Range National Park. Kinabatangan River, the second longest river in Malaysia runs through Sabah. The highest point of Sabah, Mount Kinabalu is also the highest point of Malaysia.

The earliest human settlement in Sabah can be traced back to 20,000–30,000 years ago along the Darvel Bay area at the Madai-Baturong caves. The state has had a trading relationship with China starting from the 14th century AD. Sabah came under the influence of the Bruneian Empire in the 14th and 15th centuries. The state was subsequently acquired by the British North Borneo Chartered Company in the 19th century. During World War II, North Borneo was occupied by the Japanese for three years. It became a British Crown Colony in 1946. On 31 August 1963, the newly-renamed Sabah was granted self-governance by the British. Following this, Sabah became one of the founding members of the Federation of Malaysia (established on 16 September 1963) alongside the Crown Colony of Sarawak, the Colony of Singapore (expelled in 1965), and the Federation of Malaya (Peninsular Malaysia or West Malaysia). The federation was opposed by neighbouring Indonesia, which led to the Indonesia–Malaysia confrontation over three years along with the threats of annexation by the Philippines along with the Sultanate of Sulu, threats which continue to the present day.

Bandar Seri Begawan (BSB) is the capital and largest city of Brunei. It is officially a municipal area (kawasan bandaran) with an area of 100.36 square kilometres (38.75 sq mi) and an estimated population of 100,700 as of 2007. It is part of Brunei–Muara District, the smallest yet most populous district which is home to over 70 percent of the country's population. It is the country's largest urban centre and nominally the country's only city. The capital is home to Brunei's seat of government, as well as a commercial and cultural centre. It was formerly known as Brunei Town until it was renamed in 1970 in honour of Omar Ali Saifuddien III, the 28th Sultan of Brunei and the father of Sultan Hassanal Bolkiah.

The history of Bandar Seri Begawan can be traced back to the establishment of a Malay stilt settlement on the waters of the Brunei River which became the predecessor of Kampong Ayer today. It became the capital of the Bruneian Sultanate from the 16th century onwards, as well as in the 19th century when it became a British protectorate. The establishment of a British Residency in the 20th century saw the establishment of modern-day administration on land, as well as the gradual resettlement of the riverine dwellers to the land. During World War II, the capital was occupied by the Japanese forces from 1941 and bombed in 1945 upon liberation by Allied forces. Brunei's independence from the British was declared on 1 January 1984 on a square in the city centre.

Tawau (Malaysian: [ˈta wau]), formerly known as Tawao, is the capital of the Tawau District in Sabah, Malaysia. It is the third-largest city (or town) in Sabah, after Kota Kinabalu and Sandakan. It is located on the Semporna Peninsula in the southeast coast of the state in the administrative centre of Tawau Division, which is bordered by the Sulu Sea to the east, the Celebes Sea to the south at Cowie Bay and shares a border with North Kalimantan, Indonesia. The town had an estimated population as of 2010, of 113,809, while the whole municipality area had a population of 397,673 (including 47,466 in Kalabakan, subsequently split off to form a separate district). The municipal area had a population of 372,615 at the 2020 Census.

Before the founding of Tawau, the region around it was the subject of dispute between the British and Dutch spheres of influence. In 1893, the first British merchant vessel sailed into Tawau, marking the opening of the town's seaport. In 1898, the British set up a settlement in Tawau. The North Borneo Chartered Company (BNBC) accelerated growth of the settlement's population by encouraging the immigration of Chinese. Consequent to the Japanese occupation of North Borneo, the Allied forces bombed the town in mid-1944, razing it to the ground. After the Japanese surrender in 1945, 2,900 Japanese soldiers in Tawau became prisoners of war and were transferred to Jesselton. Tawau was rebuilt after the war, and by the end of 1947, the economy was restored to its pre-war status. Tawau was also the main point of conflict during the Indonesia–Malaysia confrontation from 1963 to 1966. During that period, it was garrisoned by the British Special Boat Section, and guarded by Australian Destroyers and combat aircraft. In December 1963, Tawau was bombed twice by Indonesia and shootings occurred across the Tawau-Sebatik Island international border. Indonesians were found trying to poison the town's water supply. In January 1965, a curfew was imposed to prevent Indonesian attackers from making contact with Indonesians living in the town. While in June 1965, another attempted invasion by the Indonesian forces was repelled by bombardment by an Australian destroyer. Military conflict finally ended in December 1966.

UTC+09:00 is an identifier for a time offset from UTC of +09:00.

During the Japanese occupations of British Borneo, Burma, Hong Kong, Dutch East Indies, Malaya, Philippines, Singapore, and French Indochina, it was used as a common time with Tokyo until the fall of the Empire of Japan.