You're thinking of the Antarctic Treaty.
France, Australia, Norway, Britain, Argentina and Chile claim territory on Antarctica.
All current territorial claims -- 100% -- on Antarctica, currently held in abeyance by the Antarctic Treaty, were made by sovereign nations.
Both Chile and Argentina claim territory in Antarctica, however, the claims are invalid given the governance of the continent by the Antarctic Treaty.
Argentina and Chile are among the nation states that claim territory in Antarctica. You can read more about these claims, some of which overlap, below.
So far, the new nation of the Republic of South Sudan has made no claim on the Antarctic continent's territory.
No country has claim to Antarctica
When one works and lives in Antarctica on a temporary basis, one is allowed to claim temporary residence in Antarctica.
The Antarctic Treaty, which has been signed by 54 nations, recognizes Antarctica as a continent for peaceful purposes only, meaning no nation can claim sovereignty over it.
Two research stations claim French support:Concordia Station, in joint support with ItalyDumont d'Urville Station
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Several South American countries claim portions of Antarctica, but no country controls the continent, including other countries in the world that also claim portions of Antarctica.