The Arda is a 56 km long torrent of Emilia-Romagna, Italy, nearly all of its course being within the province of Piacenza. It is a right tributary of the Po River.
It rises at an elevation of 1,200 metres in the Ligurian Apennines on the north-west slopes of Monte Lama (near Monte Menegosa), within the commune of Morfasso. After about 15 kilometres, at an elevation of 341 metres, it is dammed to form the Lago di Mignano reservoir which covers about 2 square kilometres and provides both a water supply and hydro-electric power.
