Where does the best wine in Spain come from?

For instance, Spain has a wide range of vineyards with different soil types and grape varieties, not to mention the different coastal factors. Most remarkably Rioja, world famous for Tempranillo the main basis for red wines, Ribera del Duero, contributing to strong and well made wines, Priorat, known for full-bodied and compensated red wines and Rias Baixas, recognized for the aromatic and crisp white Albarino wines make quality wines in Spain the top-rated.
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