Sparkling wine lovers are no strangers to Prosecco, a grape synonymous with Glera. Produced in northeastern Italy, Prosecco is most commonly made in spumante (sparkling) and frizzante (semi-sparkling) formats. Glera is the dominant grape used in Prosecco production, though up to 15% of other varieties is permitted. Wines labeled Prosecco are made in nine provinces across Veneto and Friuli Venezia-Giulia. In 2019, Prosecco’s famed hills of Conegliano and Valdobbiadene became a designated UNESCO World Heritage site.