Answer
Vaucluse, the answer, is a department in the Provence-Alpes-Côte d'Azur region in southeastern France. It's known for its varied landscape, including the Luberon and Mont Ventoux mountains, the Sorgue River, and the Rhône Valley. The area is also rich in historical and cultural heritage, with Roman ruins, medieval villages, and famous vineyards producing renowned wines like Châteauneuf-du-Pape and Gigondas.