[platinumrad]

How do you define "Japan"?

[rayiner]

The standard way. The same way you define “Thailand” or “Bangladesh” or “Vietnam?”

[platinumrad]

It seems like "Japan" will very much still exist in either of your scenarios then.

[throwawaypath]

The nation state located on the islands of Japan populated with almost exclusively Japanese people.

[platinumrad]

Good news then: it's still going to be there in a hundred years!

[throwawaypath]

It won't be "Japan" if they start importing immigrants by the tens of millions.

[red-iron-pine]

they're islands mon ami, it's not hard to define them -- the borders are fairly straightforward

you can piddle around about a few tiny islands elsewhere, e.g. okinawa, but the main islands are undisputedly "japan"

[platinumrad]

Sounds like it will still exist then, barring climate catastrophe.