<Tr> <Th> Grapes produced </Th> <Td> Tempranillo, Viura, Garnacha, Graciano, Mazuelo </Td> </Tr> <Tr> <Th> No. of wineries </Th> <Td> 600 </Td> </Tr> <P> Rioja (ˈrjoxa) is a wine region in Spain, with Denominación de Origen Calificada (D.O. Ca., "Qualified Designation of Origin"). Rioja wine is made from grapes grown in the autonomous communities of La Rioja and Navarre, and the Basque province of Álava . Rioja is further subdivided into three zones: Rioja Alta, Rioja Baja and Rioja Alavesa . Many wines have traditionally blended fruit from all three regions, though there is a slow growth in single - zone wines . </P> <P> The harvesting of wine in La Rioja has an ancient lineage with origins dating back to the Phoenicians and the Celtiberians . The earliest written evidence of the existence of the grape in La Rioja dates to 873, in the form of a document from the Public Notary of San Millán dealing with a donation to the San Andrés de Trepeana (Treviana) Monastery . As was the case in many Mediterranean lands in mediaeval times, monks were the main practitioners of winemaking in La Rioja and great advocates of its virtues . In the thirteenth century, Gonzalo de Berceo, clergyman of the Suso Monastery in San Millán de la Cogolla (La Rioja) and Spain's earliest known poet, mentions the wine in some of his works . </P>

What grapes are used to make rioja wine
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