Century-old vines still exist in many regional vineyards and allow for the production of long-aging, robust red wines with intense fruit and enhanced tannic content. The best known appellation is the DOCG (Denominazione di Origine Controllata e Garantita) Barbera d'Asti in the Piedmont region: the highest-quality Nizza DOCG wines are produced within a sub-zone of the Barbera d'Asti production area. When young, the wines offer a very intense aroma of fresh red cherries and blackberries. In the lightest versions notes of cherries, raspberries and blueberries and with notes of blackberry and black cherries in wines made of more ripe grapes. Many producers employ the use of toasted oak barrels, which provides for increased complexity, aging potential, and hints of vanilla notes. The lightest versions are generally known for flavors and aromas of fresh fruit and dried fruits, and are not recommended for cellaring. Wines with better balance between acid and fruit, often with the addition of oak and having a high alcohol content are more capable of cellaring; these wines often result from reduced-yield viticultural methods.