Well yes, it is entirely arbitrary. One of the most agreed-upon factors is that “at least as big as Australia” is a requirement, but there’s no hard reason for that requirement
Personally I think we should consider particarly big mountain ranges and deserts as continental boundaries more often, like we do with the Urals in nodels that separate Asia and Europe. “Asia” is such a huge concept as to be almost useless, and it’s not like China and Arabia had much influence on each other historically
And then at that rate, Greenland could be counted, or Australia and Antarctica left out.
Well yes, it is entirely arbitrary. One of the most agreed-upon factors is that “at least as big as Australia” is a requirement, but there’s no hard reason for that requirement
Personally I think we should consider particarly big mountain ranges and deserts as continental boundaries more often, like we do with the Urals in nodels that separate Asia and Europe. “Asia” is such a huge concept as to be almost useless, and it’s not like China and Arabia had much influence on each other historically
You do have “regions” already kind of filling that niche. MENA, Europe, Central Asia, East Asia and so on.