The River Nore is a long river located in south-east of Ireland. Along with the River Suir and River Barrow, it is one of the constituent rivers of the group known as the Three Sisters. The river drains approximately of Leinster. The long term average flow rate of the River Nore is 42.9 cubic metres per second (m³/s) The river rises in the Devil's Bit Mountain, County Tipperary. Flowing generally southeast, and then south, before emptying into the Celtic Sea at Waterford Harbour, Waterford.