Home Learn DOCa (Denominacin de origen calificada) Decanter Staff November 11, 2010 The highest quality wine designation in Spain. Rioja was the first DO to be promoted. Written by Latest Wine News Editors’ picks: Bonus tips on wines to watch – December 2025 Is America’s political instability hurting the wine industry? Six Swiss Syrah to convert the most die-hard Rhône lover DWWA winners tasting in the heart of South Korea Historic Santorini vineyards struggle against climate change and tourism