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Ballyhaunis (Irish: Béal Átha hAmhnais) is a town in County Mayo, Ireland.
The town grew up around St Mary's Augustinian Friary, founded in 1348. The population today is around 1,500.
Ballyhaunis is situated at the crossroads of national routes N60 and N83 and on the railway line connecting Dublin to Westport and Ballina.