In your opinion where do you think most scammers come from? I think either Nigeria or India from me with Russia being an honorable mention.
There are scammers everywhere waiting and lurking for their next victim.
Location based, countries with broken justice system, hyper-corrupt and with bad relations with the victim's country tend to thrive. I remember reading long ago that, within the US Florida had the highest spammer per capita within the nation. Not sure if scammers as well.