Tempranillo is one of the most famous and important red grape variety forming the backbone of some of the best/finest wines from Spain, as well as often Portugal too.
The red wines from Rioja and Ribera del Duero even though often blended, have a dominant proportion of Tempranillo at its core. In Portugal, Tempranillo is widely used including in the Douro Valley where it comes under the synonym name Tinta Roriz.
Tempranillo vines have been successfully planted in the New World, like in California, Argentina or Australia for example. You may occasionally find it in the South of France as well (Languedoc).
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