Spanish wines are renowned for their diversity and quality, produced in various regions across Spain. The most famous wine regions include Rioja, known for its red wines made primarily from the Tempranillo grape, and Ribera del Duero, which also focuses on robust reds. Other notable regions include Priorat and Cava, the latter being famous for its sparkling wines. The classification of Spanish wines is based on aging, with categories such as Joven (young), Crianza, Reserva, and Gran Reserva. Each category indicates the time the wine has spent aging in barrels and bottles, influencing its flavor and complexity.