Arda is a river in the Province of Piacenza, Emilia-Romagna, Italy. It is a right tributary of the Po. For the Second World War frigate class, see River class frigate The Murray River in Australia A river is a large natural waterway. ... Piacenza (It. ... Emilia-Romagna is an administrative region of Northern Italy comprising the two historic regions of Emilia and Romagna. ... PO or po may stand for: the Po River in Italy Pô, the town in Burkina Faso Pô (département), part of the Napoleonic Empire Po, one of the Teletubbies. ...