Which grape blends are primarily used in the Southern Rhône Valley?

The GSM blend, consisting of Grenache, Syrah, and Mourvèdre, is primarily used in the Southern Rhône Valley because these varietals are perfectly suited to the region's climate and soil conditions. Grenache is often the dominant grape in many Southern Rhône wines, contributing red fruit flavors and alcohol, while Syrah adds depth, structure, and spicy notes. Mourvèdre complements the blend with its tannic backbone and complexity.

This triad of grapes allows for a diverse range of flavors and styles, reflecting the terroir of the Southern Rhône. The blends are well known for their ability to age, showing evolving characteristics over time. The success of the GSM blend in this region is also supported by its historical significance; many of the most iconic wines of the Southern Rhône, such as Châteauneuf-du-Pape, are based on this combination.

The other options involve grape varieties or blends that are not characteristic of the Southern Rhône Valley. Bordeaux blends come from a different region with its own signature varietals, while the last two options reference grapes more commonly associated with regions such as Spain for Tempranillo and Garnacha or Burgundy and other regions for Pinot Noir, Syrah, and Merlot. Thus, the GSM