To distinguish Argentinian wines from the La Rioja province from those of Spain, what labelling term is used?

The term "Famatina" is used specifically to distinguish Argentinian wines from the La Rioja province from those produced in Spain. The Famatina is a significant geographical and winemaking reference within Argentina’s La Rioja, representing the region's unique terroir and wine characteristics. This distinction is crucial for wine labeling as it helps consumers identify the origin of the wine and avoid confusion with Spanish Rioja, which has its own distinct identity and wine style.

In contrast, the other terms, while relevant to the context, do not serve the purpose of differentiating Argentinian wines from their Spanish counterparts effectively. "Rioja" refers to the Spanish region synonymous with a specific style of wine, while "Riojana" and "La Riojana" are likely to associate more closely with the Spanish region and its wines rather than clearly indicating Argentine origin. Thus, using "Famatina" clarifies the origin of the Argentinian wines and signifies that they belong to a separate winemaking tradition.