Perhaps the best known is Grana Padano, produced in Lombardy, where "Padano" refers to the Po Valley. Compared to Parmigiano, there are less strict regulations in its production.
The Czech Republic produces Gran Moravia, a cheese similar to Parmigiano Reggiano and Grana Padano, and Argentina produces Reggianito, a cheese developed by Italian cheesemakers that is made in smaller disks and has a shorter aging period, but is essentially similar to Parmesan.
