Brazilian Antarctica
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Brazilian Antarctica is an Antarctic territory south of 60°S and from 28°W to 53°W, proposed as "Zone of Interest" by Brazil. It exists completely within the British claim as well as the Argentine one. While the substance of the claim on the territory has never been precisely defined, it does not formally contradict these other claims geographically overlapping it. Brazil formally expressed its reservations with respect to its territorial rights in Antarctica when it acceded to the Antarctic Treaty on 16 May 1975, making the first official mention of the Frontage Theory, which states (simplified) that sovereignty over each point in Antarctica properly belongs to the first country whose non-Antarctic territory one would reach when travelling north in a straight line from such a point.
Outside the zone of interest, Brazil maintains a permanent staffed research facility, the Comandante Ferraz Brazilian Antarctic Base (UN/LOCODE: AQ-CFZ), located in Admiralty Bay, King George Island, near the tip of the Antarctic Peninsula, at 62°08′S 58°40′W.
-Credit: Wikipedia