Here is some good info about the popular sparkler.
The Prosecco DOC production area covers the northeast Italian territories of: in the Veneto, five provinces (Treviso, Venice, Vicenza, Padua, Belluno), and in Friuli Venezia Giulia, four provinces (Gorizia, Pordenone, Trieste and Udine).
> Prosecco DOC totals approximately 20,000 hectares.
> Prosecco Conegliano Valdobbiadene Superiore DOCG covers the Treviso province of Veneto on the hills between the towns of Conegliano and Valdobbiadene, while there is also the smaller Asolo Prosecco Superiore DOCG, produced near the town of Asolo.
> Prosecco DOCG totals approximately 6,600ha.
> Superiore di Cartizze is a hill within the Conegliano Valdobbiadene DOCG which is famous for producing the most concentrated expression of Prosecco – and often too, the sweetest. It covers 107ha and is home to the most expensive vineyard land in Italy, with an estimated value of €1.5m-€2m per hectare.
> While Cartizze is at the top of the Prosecco Superiore DOCG quality pyramid, the Consorzio recently-introduced the Rive delimitations, which are named after particular sub-zones with distinct and high-quality terroirs.