Which white grape variety is exclusive to the northern Rhone?

Viognier is indeed a white grape variety that is primarily associated with the northern Rhône region of France, where it is notably used to produce the esteemed white wines of Condrieu and Château-Grillet. This grape thrives in the specific climatic and geological conditions of the region, which contribute to the unique flavor profile of the wines made from it, characterized by aromatic notes of peach, apricot, and floral elements.

The other varieties mentioned are associated with different wine-producing regions. Pinot Grigio is predominantly linked to Italy, particularly the northeastern regions like Friuli-Venezia Giulia and Trentino-Alto Adige. Sauvignon Blanc is widely grown globally but is primarily associated with regions like Loire Valley in France and Marlborough in New Zealand. Chenin Blanc, while versatile and cultivated in various regions, is most famously linked to the Loire Valley and South Africa, not the northern Rhône. Thus, Viognier stands out as the exclusive variety of the northern Rhône.