other cru wines. Grape varieties Different grape varieties are allowed in the different Rhône appellations; a few appellations are single variety appellations, while the regional Côtes du Rhône appellation allow 21 different varieties. In most cases, Northern Rhône appellations allow many fewer varieties than those of Southern Rhône. In many appellation regulations, a division is made into main grape varieties (indicated by "M"), supplementary varieties (indicated by "S"), and accessory varieties (indicated by "(A)"). See also List of wine-producing regions French Wine Official Rhône wine trade association website References External links Les Vins des Côtes du Rhône - Côtes du Rhône official site (6 languages) (Committee for the promotion of the production, economy and marketing of Rhône Wine) Wine regions of France