You can easily test this, of course -- the problem isn't that you, the user, cannot find out, it's that you pay for being able to use an endpoint in those countries and can't, because they don't exist.

It's not only small countries either, it affects much of Latin America, including Brazil (PIA's servers were in Miami for BR as well last time I checked). I've occasionally seen it also affect US states where e.g. Massachusetts would be served from Trenton, NJ.