A river of south-eastern Ireland, rising in the Sliab Bladma [Slieve Bloom], providing a border between counties Kildare, Carlow, and Waterford from Laois and Kilkenny, and emptying, after a distance of 120 miles, in Wexford harbour. In early Irish stories it is known as Berba. In the valley of the Barrow, Mac Cécht kills a supernatural being named Mechi, son of Mórrígan, and burns its three hearts, each one of which contains a serpent.




