The region of La Rioja lends its name to Spain`s most widely recognised wines. Rioja is split by three major districts; Alta and Alavesa to the north, which are higher in altitude and the hot dry Oriental district to the south (previously known as Rioja Baja). Tempranillo, Garnacha, Graciano and Mazuelo are the main red grape varieties used however more international varieties can also be used. The traditional aging classification system gives Rioja wines their distinctive style through the influence of extended ageing in oak barrels.