Who owns the most of antarctica's land?

Answer 1

Technically no-one owns any land in Antarctica. Various countries have staked claims in Antarctica but these have not been universally recognised and after the 1959 Antarctica treaty, which essentially prevented any future claims, Antarctica's status has been pretty much unchanged - lots of people claim to own chunks of it but everybody else says they don't.

You could say the Australians because they claim the largest chunk of it...