Castellfollit de la Roca (Catalan pronunciation: [kəsˌteʎfuˈʎid də lə ˈrɔkə]) is a municipality in the comarca of Garrotxa, in the Province of Girona, Catalonia, Spain. The urban area is bordered by the confluence of the Fluvià and Toronell rivers, between which the town's basalt cliff rises.