Barrow, river, c.120 mi (190 km) long, rising in the Slieve Bloom Mts., Co. Laoighis, central Republic of Ireland. It flows east to the Co. Kildare line, then south along the borders of several counties, past Athay (the head of navigation), Carlow, and New Ross, to Waterford Harbour. It receives the Nore and the Suir rivers.
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