Wikipedia's list of islands (https://en.wikipedia.org/wiki/List_of_islands_by_area https://en.wikipedia.org/wiki/List_of_islands_by_area) starts with a separate

Wikipedia's list of islands (https://en.wikipedia.org/wiki/List_of_islands_by_area https://en.wikipedia.org/wiki/List_of_islands_by_area) starts with a separate table for "continental landmasses", containing Afro-Eurasia, the Americas, Antarctica, and Australia. Australia is ~3.5 times the size of Greenland (the #5 landmass) so between Australia and Greenland seems a nice place to draw the lint. But Greenland is in turn ~2.5 times the size of #6 New Guinea. Maybe if Greenland were more populated (let's imagine, say, that the Earth's axis is positioned differently so that it's warmer there) it would be considered a continent?