20 km before its mouth. The river's long term average flow rate, again before it is joined by River Nore, is 37.4 cubic metres per second. At the merger with the River Nore, its catchment area is ca. 5,500 km² and its discharge over 80 m³/s.

Course

The source of the Barrow is at Glenbarrow in the Slieve Bloom Mountains in County Laois.

Some towns that the Barrow

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