The River Blackwater.

Munster.

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Blackwater. (Munster) 168km
  The river Blackwater or An Abhainn Mhór, also known as the Munster Blackwater, rises in the uplands between counties Cork and Kerry and flows towards county Waterford, on its way passing through pasture and woodlands.

At Cappoquin, County Waterford, the river turns southwards across the Drum hills and crosses a number of depressions and gorges to join St George's Channel at Youghal, where its estuary is 10 km (6 MI) long. With a length of 168 km (104 MI) the Blackwater is the longest river in Munster. It drains an area of 2,480 sq km (960 sq MI).

There are several rivers in Ireland sharing the name Blackwater.

  
Background image The River Boyne near Newgrange.