It's interesting that divisions which to me seem founded on perfectly obvious and important geographical boundaries strike you as arbitrary! I suspect this means that as someone who has been trained in geography I have been inculcated with the same geographers' mindset which informed the choice of boundaries.
Incidentally, the division of New Guinea between Oceania and Asia, is based on the political division.
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Re: curiouser and curiouser
Incidentally, the division of New Guinea between Oceania and Asia, is based on the political division.