The European Central Bank reports that over half of all counterfeit euro notes that are in circulation was made in the Campania region in Italy.
On average, a total of 550,000 to 800,000 counterfeit euro notes are detected and removed from circulation each year.Most of the fake money are in 20 and 50 euro notes.
Source: Rachel Donadio, “In Italy, Fake Euros That Even the Authorities Admire,” New York Times, April 30, 2012.