Before 2009, the only truly territorial unit within the larger Conegliano-Valdobbiadene Prosecco area was Cartizze, the historic 107-ha hill located close to the town of Valdobbiadene. Those winemakers used to supply the parties of well-off Milanese with rich, exuberant, mostly sweetish sparkling wine. Then many Prosecco producers woke up to the fact they could  produce something called ‘Rive’ Prosecco Conegliano Valdobbiadene: this possibility came as changes to the denomination rules, mandating stricter production guidelines for the new category.