The list of islands by region will differ from any list of islands by country. Hawaii, for example, is under Pacific, separated from its compatriot islands under North America. So long as it is a list by region, this is how it should be done. - Tim
Is Australia itself regarded as an island (in which case wouldn't it be the largest?), or is it a continental land mass? -- DrBob
If you look at the island/continent issue from the viewpoint of continental drift, it's easy to tell whether a landmass is an island or a continent. Islands are either seamounts, (Hawaii, Iceland) or they are the landmasses associated with a continental plate except for the largest landmass. The largest landmass on a plate, of course, is designated as the continent for that continental plate. I doubt that this is an official rule, but it is a logical one. If you use it, you can see that Greenland is an island but Australia is a continent. -- Derek Ross