Ardèche is a department in the Auvergne-Rhône-Alpes region of Southeastern France. It is named after the river Ardèche and had a population of 328,278 as of 2019. Its largest cities are Aubenas, Annonay, Guilherand-Granges, Tournon-sur-Rhône and Privas (prefecture). Its prefecture is in Privas, but its largest city is Annonay.