The River Nore is one of the principal rivers in the South-East Region of Ireland. The 140-kilometre-long (87 mi) river drains approximately 2,530 square kilometres (977 sq mi) of Leinster and Munster, that encompasses parts of three counties. 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 Suir is a river in Ireland that flows into the Atlantic Ocean through Waterford after a distance of 185 kilometres (115 mi). The catchment area of the Suir is 3,610 km2. Its long term average flow rate is 76.9 cubic metres per second (m3/s), about twice the flow of either the River Barrow or the River Nore before these join, but a little less than the Barrow's flow when it meets the Suir 20 km downstream.