The meridian 129° east of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Asia, Australia, the Indian Ocean, the Southern Ocean, and Antarctica to the South Pole.
The 129th meridian east forms a great circle with the 51st meridian west.
The Halmahera Sea (Indonesian: Laut Halmahera; Indonesian pronunciation: [ˌlaʊt̪̚ halmaˈhera]) is a regional sea located in the central eastern part of the Australasian Mediterranean Sea. It is centered at about 1°S and 129°E and is bordered by the Pacific Ocean to the north, Halmahera to the west, Waigeo and Southwest Papua to the east, and the Seram Sea to the south. It covers about 95,000 km (about 37,000 miles) and its topography comprises a number of separate basins and ridges, the chief of which is the Halmahera Basin reaching a depth of 2,039 m.
On its western side, the Halmahera Sea includes three large gulfs or bays which cut deep into the coast of Halmahera island, turning the east coast of that island into four huge peninsulas. These three inlets comprise Wedi Bay (Teluk Wesi) in the south (between the southern and southeastern peninsulas), Buli Bay (Teluk Buli) in the centre (between the southeastern and northeastern peninsulas) and Kao Bay (Teluk Kao) in the north (between the northeastern and northern peninsulas). A notable fourth inlet is Galela Bay (Teluk Galela) further to the north, which projects into the coast of North Halmahera Regency.
New South Wales (commonly abbreviated as NSW) is a state on the east coast of Australia. It borders Queensland to the north, Victoria to the south, and South Australia to the west. Its coast borders the Coral and Tasman Seas to the east. The Australian Capital Territory and Jervis Bay Territory are enclaves within the state. New South Wales' state capital is Sydney, which is also Australia's most populous city. In December 2024, the population of New South Wales was over 8.5 million, making it Australia's most populous state. Almost two-thirds of the state's population, 5.3 million, live in the Greater Sydney area.
The Colony of New South Wales was founded as a British penal colony in 1788. It originally comprised more than half of the Australian mainland with its western boundary set at 129th meridian east in 1825. The colony then also included the island territories of Van Diemen's Land, Lord Howe Island, and Norfolk Island. During the 19th century, most of the colony's area was detached to form separate British colonies that eventually became the various states and territories of Australia. The Swan River Colony (later called the Colony of Western Australia) was never administered as part of New South Wales.
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.
The land border of Western Australia (WA) bisects mainland Australia, nominally along 129th meridian east longitude (129° east). That land border divides WA from the Northern Territory (NT) and South Australia (SA). However, for various reasons, the actual border (as surveyed and marked or otherwise indicated on the ground) deviates from 129° east and is not a single straight line.
The Western Australian town closest to the border is Kununurra, which is about 25 kilometres (16 mi) west of the border with the NT. The settlement outside WA that is closest to the border is Border Village, SA, which adjoins the border; the centre of Border Village is about 250 metres (820 ft) from the border, on the Eyre Highway.
Albany (/ˈælbəni/ AL-bən-ee; Nyungar: Kinjarling) is a port city in the Great Southern region in the Australian state of Western Australia, 418 kilometres (260 mi) southeast of Perth, the state capital. The city centre is at the northern edge of Princess Royal Harbour, which is a part of King George Sound. The central business district is bounded by Mount Clarence to the east and Mount Melville to the west. The city is in the local government area of the City of Albany. While it is the oldest colonial, although not European, settlement in Western Australia – predating Perth and Fremantle by over two years – it was a semi-exclave of the Colony of New South Wales for over four years until it was made part of the Swan River Colony.
The settlement was founded on 26 December 1826 as a military outpost of New South Wales for the purpose of forestalling French ambitions in the region. To that end, on 21 January 1827, the commander of the outpost, Major Edmund Lockyer, formally took possession for the British Crown of the portion of New Holland not yet claimed by the Crown; that is, the portion west of the 129th meridian east, with the portion east already being claimed collectively by the Crown as New South Wales and Van Diemen's Land. During the last decade of the 19th century, the town served as a gateway to the Eastern Goldfields. For many years, it was the colony's only deep-water port, having a place of eminence on shipping services between Britain and its Australian colonies. The opening of the Fremantle Inner Harbour in 1897, however, saw its importance as a port decline, after which the town's industries turned primarily to agriculture, timber and later, whaling.