Nature and history are combined in Arnes, with spectacular results for visitors. The orography of the municipality is divided between the mountains and the plain, with the Nature Park of Els Ports and the two rivers that run across the plain (Algars and Estrets).The municipality is one of the western limits of Catalonia, where it communicates directly with el Matarranya.The historic ensemble of the urban centre has an intense Medieval atmosphere, with the town hall building standing out.