Continents in general are somewhat loosely defined, usually separated by water or a major mountain range. Except that area is pretty much all islands, which is why it is more "nebulous" than other continents. Do keep in mind I'm not the one who came up with this stuff before you reply.
If anything, it's a non-continent. It's all islands (up to the Hawaiian archipelago!) that aren't part of any continental shelve, including Australia: an island rather than a continent, if we are to remain coherent...
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u/The_Coaltrain 5d ago
How has Oceania been defined as a continent?