The Tar (Irish: An Teara) is a river in County Tipperary, Ireland. It joins the Suir between the towns of Ardfinnan and Newcastle. The Tar's tributaries include the River Duag which joins it shortly after they both flow through Clogheen.
Map of River Tar, Co. Tipperary, Ireland
The Tar was an important source of power to drive grain processing mills up to the 19th century.
References
River Tar Wikipedia(Text) CC BY-SA