[HamiltonJay]

I would add, its not mentioned because the human being who wrote it down had no idea that 4 other continents even existed let alone would one day have nations upon them.

I highly suspect Australia, Antarctica, or any other nation on North or South America is mentioned.

[xzins]

I think their understanding of “the world” could have an impact on their understanding of the ac’s causing all to follow him.

But then we’re told that the kings of the east are gathering separately from him. Not to say they didn’t agree with him, but they seem to be a separate coalition.

[Star Traveler]

I would add, its not mentioned because the human being who wrote it down had no idea that 4 other continents even existed let alone would one day have nations upon them.

The only kind of person who would say what you just stated is someone who doesn't believe that God knows the beginning from the end (as He says) and doesn't believe in the infallibility and inerrancy of the "Word of God" and doesn't believe (or doesn't know) anything about the "Inspiration of the Scriptures".

I conclude you are that type of person.