Rioja is Spain's most famous wine region. Divided into three subregions - Rioja Alta, Rioja Alavesa and Rioja Oriental - each with their unique characteristics, Rioja produces predominantly red wines from Tempranillo and Garnacha. Barrel-aging is almost mandatory in Rioja, so look for these terms on labels: Crianza, Reserva or Gran Reserva. Crianza being the least expensive is consequently the most produced. As for white wines Malvasia was Rioja's favourite but now the emphasis shifted to Viura.