The Grignan-Les Adhemar AOC (formerly the Côteaux du Tricastin) is the northernmost wine-growing AOC in the southern area of the Rhône wine region of France. The wines are produced in 21 communes in the department of Drôme on the east bank of the Rhône River in a triangle bounded by Saint-Paul-Trois-Châteaux, Montélimar, and Grignan; opposite the Côtes du Vivarais AOC on the right bank. the vineyards straddle both the true Mediterranean and the continental climatic regions where in this part of France the transition is rapid, winter snow being frequent in Montélimar but rare some 20 - 30 kilometres further south. In this transitional area between the northern and southern Rhône wine regions that constitutes the northern limit of the Provence, the climate in Baume-le-Transit and St Paul are