Australia claims 42% of Antarctica, but only four other nations agree

Nature · Published 29 September 2026 Swipe more like this →

In short: The Australian Antarctic Territory is a massive, frozen expanse covering over five million square kilometers. While Australia asserts sovereignty over this sector, the 1959 Antarctic Treaty effectively puts that claim on ice. Today, it remains a unique legal paradox where scientific research and environmental protection take precedence over national borders.

The Australian Antarctic Territory (AAT) represents the largest sector of the continent claimed by any single nation. Transferred from the United Kingdom to Australia in 1933, the territory spans roughly 5,900,000 square kilometers, accounting for 42% of Antarctica's total land area. Despite this, the region is largely uninhabited, hosting only seasonal research staff who fluctuate between 80 people in winter and 500 during the summer months. The environment is extreme, with wind speeds reaching 320 kilometers per hour and inland temperatures plummeting to -80 °C.

The legal status of the AAT is complex. While Australia maintains its claim, it is an original signatory of the 1959 Antarctic Treaty, which holds all territorial claims in abeyance. Only four countries—New Zealand, the United Kingdom, France, and Norway—formally recognize Australia's sovereignty. The territory is governed by a hierarchy of laws, starting with Commonwealth legislation and extending to the laws of the Australian Capital Territory. However, these rules do not apply to foreign observers or citizens of other treaty signatories unless they voluntarily consent.

Beyond sovereignty, Australia has focused on environmental stewardship and scientific collaboration. The 1991 Madrid Protocol, which entered into force in 1998, designated the continent as a nature reserve and banned mining. Australia also engaged in a high-profile legal battle at the International Court of Justice, which ruled in 2014 that Japan's whaling in the Southern Ocean was not scientific in nature. Today, the 2016 Australian Antarctic Strategy emphasizes both the preservation of the AAT and the maintenance of the broader Antarctic Treaty System, ensuring the continent remains free from strategic competition.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?

Related

• The British Antarctic Territory is a massive, ice-covered wedge claimed by the United Kingdom.
• The Antarctic ends at a shifting line in the sea, not at the coast
• The Ross Dependency is a vast Antarctic territory claimed by New Zealand since 1923
• Chile claims a vast slice of Antarctica, but the Antarctic Treaty freezes the dispute.
• Why do seven nations claim ownership of the frozen continent of Antarctica?
• Despite their name, the Australian Shepherd was actually developed in 19th-century California.
• How a global rubber boom turned the Congo into a state-sponsored slaughterhouse
• Why some regions govern themselves while remaining part of a larger sovereign state
• North Africa’s spine was built in three slow collisions
• The Crimean Peninsula is a complex mosaic of steppes, mountains, and strategic coastlines.
• The Atlantic Wall was a massive, unfinished fortification system built to stop Allied invasion.
• Beyond the Battlefield: How India Honors Both Soldiers and National Icons

More in Physical geography · More in Nature · Latest · A–Z · All topics