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| Borders of Australia | |
|---|---|
| Name | Australia |
| Continent | Australia |
| Capital | Canberra |
| Largest city | Sydney |
| Area km2 | 7692024 |
| Borders | Pacific Ocean, Indian Ocean, Southern Ocean |
| Eez km2 | 8600000 |
Borders of Australia
Australia is a sovereign country and continent-state bounded by the Pacific Ocean, the Indian Ocean, the Southern Ocean and maritime neighbors including Indonesia, Papua New Guinea, East Timor, New Zealand and the island states of the Pacific Islands Forum. The nation's external limits encompass continental margins, island territories such as Christmas Island, Cocos (Keeling) Islands, Norfolk Island and external territories administered from Canberra with legal instruments including the Australian Constitution and international instruments such as the United Nations Convention on the Law of the Sea.
Australia's periphery includes both continental shorelines and scattered insular territories: the continental mainland and the island of Tasmania are the primary landmasses, while external territories such as Heard Island and McDonald Islands, Ashmore and Cartier Islands, Lord Howe Island and the Coral Sea Islands extend national jurisdiction. Sovereignty and jurisdiction derive from historical acts like the Colonial Boundaries Act 1895 antecedents and statutes including the Territories of Australia Act 1914 and decisions of the High Court of Australia. Regional diplomacy engages multilateral forums including the South Pacific Forum and bilateral arrangements with states such as Indonesia and Papua New Guinea.
Australia has no land borders with other countries on the mainland; the only land border exists between the Australian mainland and the island state of Tasmania via territorial sea claims and internal transit links such as the Bass Strait (Australia) crossing. Internal state and territory borders separate New South Wales, Victoria, Queensland, Western Australia, South Australia, Northern Territory and Tasmania; these boundaries were established by colonial proclamations like the Letters Patent 1825 and decisions by the Privy Council (United Kingdom). The landward limits of external territories vary: Norfolk Island is administered under the Norfolk Island Act 1979 (and later amendments), while Christmas Island and Cocos (Keeling) Islands have boundaries defined by the Indian Ocean maritime delimitation treaties and administrative instruments.
Maritime delimitation with neighbors is governed by the United Nations Convention on the Law of the Sea and bilateral treaties such as the maritime boundary agreements with Papua New Guinea and France concerning New Caledonia and Wallis and Futuna. Australia’s Exclusive Economic Zone covers about 8.5 million square kilometres, overlapping with zones of Indonesia, Timor-Leste and New Zealand. Notable delimitation instruments include the Timor Gap Treaty (superseded by later treaties), the Maritime Boundaries Treaty (Australia–France) and determinations by international bodies such as the International Court of Justice and arbitral tribunals handling disputes involving East Timor and Indonesia. Australia enforces maritime jurisdiction through agencies like the Australian Border Force, the Royal Australian Navy and the Australian Fisheries Management Authority with operational assets including HMAS Stuart-class and patrol vessels.
Australia’s internal borders separate six states—New South Wales, Victoria, Queensland, Western Australia, South Australia and Tasmania—and several mainland territories including the Northern Territory and the Australian Capital Territory. The Australian Capital Territory encloses Canberra and was created under the Seat of Government Acceptance Act 1909 and the Seat of Government Surrender Act 1909. State boundary markers and surveying projects were influenced by figures such as Edmund Barton era ministers and surveyors like Alexander Forrest. Inter-state compacts and High Court rulings, including cases brought under Chapter III jurisdiction, resolve jurisdictional disputes over resources shared across boundaries like the Murray River and cross-border infrastructure such as the Pacific Highway and the Indian Pacific rail corridor.
Australia’s external border control frameworks are implemented by the Department of Home Affairs, the Australian Border Force and the Department of Immigration and Border Protection predecessors, guided by legislation including the Migration Act 1958 and the Customs Act 1901. Policy responses to irregular maritime arrivals involved operations such as Operation Sovereign Borders and international cooperation with Indonesia and regional partners including the Pacific Islands Forum and UNHCR. Airports like Sydney Airport, Melbourne Airport, Brisbane Airport and seaports such as Port of Darwin and Port of Fremantle host customs and immigration facilities; cross-border law enforcement engages agencies like the Australian Federal Police and international agreements including bilateral removal and readmission arrangements with states such as New Zealand under the Trans-Tasman Travel Arrangement.
Historical boundary changes include colonial-era transfers codified by Letters Patent and the redefinition of external territories after World War II, when control of territories such as New Guinea passed from Germany and Japan to Australia under Trust Territory of New Guinea arrangements and United Nations trusteeship instruments. Contemporary disputes have involved delimitation with East Timor, resolved partly by the Timor Sea Treaty (2002) and later arbitration under the Permanent Court of Arbitration, and negotiations with Indonesia over the continental shelf and fisheries access resolved through bilateral treaties like the Australia–Indonesia Maritime Delimitation Treaty. Sovereignty claims and environmental protections around Heard Island and McDonald Islands and Macquarie Island have engaged organizations such as the International Union for Conservation of Nature and scientific bodies including the Australian Antarctic Division due to proximity to the Antarctic Treaty System and continental shelf submissions to the Commission on the Limits of the Continental Shelf.
Category:Geography of Australia