"Barbaresco is one of the great wines of the Piedmont region in northwestern Italy... Similar to its more famous sibling Barolo, Barbaresco is made from 100 percent Nebbiolo and shares its cult status as one of the finest wines in the world. However, there are several differences between the two. Barbaresco has a slightly maritime climate: warmer, drier and milder than its neighbor. This means its grapes tend to ripen earlier than those in Barolo. As a result, the wines are less tannic and more approachable at an earlier age. However there is still plenty of acidity and tannins to make this an ageworthy red. Barbaresco is characterized by its rich, spicy flavors and perfumed sweetness and is considered more elegant and refined than its counterpart, which is a more robust and longer-lived red.
Regulations stipulate that Barbaresco must have a minimum alcohol content of 12.5 percent and undergo two years of aging, one of which must be spent in wooden barrels. For the added designation of riserva, the ageing increases to four years, with one of those years in wood." - Wine Searcher
"It is beyond question, however, that Piemonte's greatest wines are Barolo and, generally very slightly lighter and earlier maturing, Barbaresco. These are two of the wine world's pinnacles..." - Jancis Robinson
Map adapted from: Decanter