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According to what other definition? This definition was invented by the mine owners. To lure unsuspecting souls into their traps. There is no continent or small island.

Yes, even if that's the case. If there is no continent or small island, there is a mine, and you yourself said so. It is Australia by definition. If there is no mine, there is something else. A mine shaft, a quarry, a gopher, or a muskrat. It doesn't matter. If there is nothing, there is the product of our imagination, which we call Australia. It doesn't matter what Australia is; it exists by definition.