Timor Sea in the context of Surface gravity wave

Timor-Leste, also known as East Timor, officially the Democratic Republic of Timor-Leste, is a country in Southeast Asia. It comprises the eastern half of the island of Timor, the coastal exclave of Oecusse in the island's northwest, and the islands of Atauro and Jaco, for a total land area of 14,950 square kilometres (5,770 sq mi). Timor-Leste shares a land border with Indonesia to the west; Australia is the country's southern neighbour, across the Timor Sea. Dili, on the north coast of Timor, is its capital and largest city.

Timor was settled over time by various Papuan and Austronesian peoples, which created a diverse mix of cultures and languages linked to Southeast Asia and Melanesia. East Timor came under Portuguese influence in the sixteenth century, remaining a Portuguese colony until 1975. Internal conflict preceded a unilateral declaration of independence and an Indonesian invasion and annexation. The subsequent Indonesian occupation was characterised by extreme abuses of human rights, including torture and massacres, a series of events named the East Timor genocide. Resistance continued throughout Indonesian rule and in 1999, a United Nations–sponsored act of self-determination led Indonesia to relinquish control of the territory. On 20 May 2002, Timor-Leste became the first new sovereign state of the 21st century. That same year, relations with Indonesia were established and normalised, with Indonesia also supporting Timor-Leste's accession into ASEAN.

The Northern Territory (abbreviated as NT; known formally as the Northern Territory of Australia and informally as the Territory) is an Australian internal territory in the central and central-northern regions of Australia. The Northern Territory shares its borders with Western Australia to the west (129th meridian east), South Australia to the south (26th parallel south), and Queensland to the east (138th meridian east). To the north, the Northern Territory looks out to the Timor Sea, the Arafura Sea, and the Gulf of Carpentaria, including Western New Guinea and various other islands of the Indonesian archipelago.

The NT covers 1,347,791 square kilometres (520,385 sq mi), making it the third-largest Australian federal division, and the 11th-largest country subdivision in the world. It is sparsely populated, with a population of only 260,400 as of March 2025 – fewer than half the population of Tasmania. The largest population centre is the capital city of Darwin, having about 52.6% of the Territory's population. The largest inland settlement is Alice Springs with a population of about 25,000 people.

Timor (Indonesian: Pulau Timor; Portuguese: Ilha de Timor; Tetum: Illa Timór) is an island at the southern end of Maritime Southeast Asia, in the north of the Timor Sea. The island is divided between the sovereign states of Timor-Leste in the eastern part and Indonesia in the western part. The Indonesian part, known as West Timor, constitutes part of the province of East Nusa Tenggara. Within West Timor lies an exclave of Timor-Leste called Oecusse District. The island covers an area of 30,777 square kilometres (11,883 square miles). The name is a variant of timur, Malay for "east"; it is so called because it lies at the eastern end of the Lesser Sunda Islands. Mainland Australia is less than 500 km away, separated by the Timor Sea.

In fluid dynamics, gravity waves are waves in a fluid medium or at the interface between two media when the force of gravity or buoyancy tries to restore equilibrium. An example of such an interface is that between the atmosphere and the ocean, which gives rise to wind waves.

The Kimberley is the northernmost of the nine regions of Western Australia. It is bordered on the west by the Indian Ocean, on the north by the Timor Sea, on the south by the Great Sandy and Tanami deserts in the region of the Pilbara, and on the east by the Northern Territory.

The region was named in 1879 by government surveyor Alexander Forrest after Secretary of State for the Colonies John Wodehouse, 1st Earl of Kimberley.

Formally known as the Timor Sea Treaty between the Government of East Timor and the Government of Australia was signed between Australia and East Timor in Dili, Timor-Leste on 20 May 2002, the day Timor-Lesteor attained its independence from United Nations rule, for joint petroleum exploration of the Timor Sea by the two countries. The signatories of the treaty were then Australian prime minister John Howard and his East Timorese counterpart at that time Mari Alkatiri.

The treaty entered into force on 2 April 2003, following an exchange of diplomatic notes and was backdated to 20 May 2002. The treaty was to run for 30 years from the day it came into force or when a seabed boundary could be established, whichever came earlier. However, the subsequent signing of the Treaty on Certain Maritime Arrangements in the Timor Sea (CMATS) in 2007, the period of validity for the Timor Sea Treaty was extended to 2057, when the validity of CMATS also ends.

The Battle of Timor occurred in Portuguese Timor and Dutch Timor during the Second World War. Japanese forces invaded the island on 19 February 1942 and were resisted by a small, under-equipped force of Allied military personnel—known as Sparrow Force—predominantly from Australia, the United Kingdom, and the Dutch East Indies. Following a brief but stout resistance, the Japanese succeeded in forcing the surrender of the bulk of the Allied force after three days of fighting, although several hundred Australian commandos continued to wage an unconventional raiding campaign. They were resupplied by aircraft and vessels, based mostly in Darwin, Australia, about 650 km (400 mi) to the southeast, across the Timor Sea. During the subsequent fighting, the Japanese suffered heavy casualties, but they were eventually able to contain the Australians.

The campaign lasted until 10 February 1943, when the final remaining Australians were evacuated, making them the last Allied land forces to leave Southeast Asia following the Japanese offensives of 1941–1942. As a result, an entire Japanese division was tied up on Timor for more than six months, preventing its deployment elsewhere. Although Portugal was not a combatant, many Timorese and European Portuguese civilians fought with the Allies or provided them with food, shelter and other assistance. Some Timorese continued a resistance campaign following the Australian withdrawal. For this, they paid a heavy price and tens of thousands of Timorese civilians died as a result of the Japanese occupation, which lasted until the end of the war in 1945.

The Tiwi Islands (Tiwi: Ratuati Irara meaning "two islands") are part of the Northern Territory, Australia, 80 km (50 mi) to the north of Darwin adjoining the Timor Sea. They comprise Melville Island, Bathurst Island, and nine smaller uninhabited islands, with a combined area of 8,320 square kilometres (3,212 sq mi).

Inhabited before European settlement by the Tiwi (Tiwi: Tunuvivi), an Aboriginal Australian people, the islands' population was 2,348 at the 2021 census. National Geographic has characterised contemporary Tiwi Islands society as reflecting an enduring fusion between the indigenous Tiwi people's traditional beliefs and these later European settlers' Catholicism.