Mahoonagh village is four kilometres south east of the town of Newcastle West, County Limerick, Ireland. There are two villages within the parish of Mahoonagh. The parish has two main centres, Mahoonagh and Feohanagh (Feothanach) villages.Mahoonagh village is the official name and it is known locally as Castlemahon (Caisleán Uí Mhathúna) village.