Suir (shŏr) [key], river, 85 mi (137 km) long, rising on Devilsbit Mt., central Republic of Ireland. It flows south through a fertile agricultural region, then east past Clonmel and Waterford to the Barrow River, with which it forms Waterford Harbour. The Suir receives the Aherlow River and empties into the Atlantic Ocean at Waterford Harbor.
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