Azkaban, Dementors, and the Prison system

[guardianapcelt]

No: HPFGUIDX 59880

 Everyone here knows that Azkaban is Wizard prison...but with wizards 
in every country in the world, does it make sense for it to be the 
*only* wizard prison? Is Azkaban just for criminals in the same range 
that Hogwarts has (England, Scotland, Ireland, Wales), or does it 
extend further to include Western Europe? Furtheremore, are dementors 
used universally as Enforcers in Wizarding prisons? If not, what 
methods are used to keep the prisoners in, and how reliable are they? 
Thoughts? Opinions? Comments? Rotton fruit? I'd welcome all, this has 
been plauging my mind all day.
                               - Joe S.