These northern Italian regions have a large number of noted producers that benefit from cooler weather at an altitude better suited to grappa production with more acidic grapes and more favourable conditions for storing pomace.
Pomace brandy is produced in most traditional wine making countries, with each country having its own term for the resulting spirit, i.e. 'marc' in France and 'bagaceira' in Portugal. USA producers cause some confusion with the Italian product by also using the name grappa.

Italian wine regions