Its this formula that inspired former Vega Sicilia winemaker Xavier Auss to claim Ribera del Duero as the best region in the world for red wines. This region is a 10, said Auss several years ago during my previous visit to Ribera del Duero (RDD), which lies in the heart of the autonomous community of Castilla y Len. If someone is making a wine here that rates a 5, that person is delinquent.Charred oak and slightly overripe aromas make for a bullish nose. On the palate, this delivers a jolt of acidity along with oversize tannins, while ripe plum and cassis flavors.