The Australian Antarctic Territory (AAT) is a part of Antarctica. It was claimed by the United Kingdom and placed under the authority of the Commonwealth of Australia in 1933. It is the largest territory of Antarctica claimed by any nation. In 1961, the Antarctic Treaty came into force. Article 4 deals with territorial claims, and although it does not renounce or diminish any preexisting claims to sovereignty, it also doesn't prejudice the position of Contracting Parties in their recognition or non-recognition of territorial sovereignty. As a result, only four other states recognize Australia's claim to sovereignty in Antarctica.
Area
AAT consists of all the islands and territory south of 60°S and between 45°E and 160°E, except for Adélie Land (136°E to 142°E), which divides the territory into Western AAT (the larger portion) and Eastern AAT. It is bounded by Queen Maud Land in the West and by Ross Dependency in the East. The area is estimated at 5,896,500 km².
The territory is inhabited by the staff of research stations. The Australian Antarctic Division administers the area primarily by maintaining three year-round stations (Mawson, Davis and Casey), which support various research projects.