The Drôme is located in the southwest of the historic region of Dauphiné, it extends from north to south on the left bank of the Rhone Valley and further east on the foothills and the Vercors. The Prefecture of Valencia is, in form and extent, is the counterpart of the department of Ardèche which is on the right bank of the Rhone. The Rhone Valley, the Drôme is the main access road to Provence. It offers from north to south transition from a climate and landscape to the Mediterranean. To the north the Drome hills has a similar climate and landscape of Mont du Lyonnais. Valence is located in a plain east of the Vercors plateau to alpine climate marked. The region of Montelimar, the Diois and the valley of the Drôme are spaces of transition between the Alps and Provence, and finally the Drôme Provençale includes hills and valleys of Tricastin Baronnies at the foot of Mont Ventoux, they are already significantly Mediterranean are part of the Provence at least in the sense of the term tourist and they offer the visitor eager to scenic wealth often unsuspected. Grignan and Buis les Baronnies are examples. The south of Drôme offers a special administrative: Valréas and some communes of the Vaucluse form an enclave in the department.