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If Australia is a continent then what continent are New Zealand and New Guinea in?

They are not part of a continent, but simply islands (well, groups of islands).

Some definitions would include them as part of Oceania.

> Some definitions would include them as part of Oceania.

Some? All, AFAICS. (Or at the very least, most.)

New Zealand is part of Zealandia continent (which nowadays is mostly submerged)