Which of the following is not a principal white grape produced in Veneto?

Sauvignon Blanc is not considered one of the principal white grape varieties produced in Veneto. This region is primarily renowned for its production of other white grape varieties, such as Garganega, which is the key grape in Soave, and Pinot Grigio, which is highly popular and widely recognized both in Italy and internationally. Trebbiano, another vital white grape in Italy, is also grown in Veneto, contributing to the region's diverse wine offerings.

While Sauvignon Blanc is indeed produced in Italy, it is more commonly associated with regions like Friuli-Venezia Giulia and Tuscany. Veneto's more prominent focus on Garganega, Pinot Grigio, and Trebbiano underlines its unique identity among Italy's wine-producing regions.