Castlereagh (Irish: An Caisleán Riabhach) is a barony in County Roscommon, Ireland. It is named after the town of Castlerea within the barony. Its area in 1891 was 82,081 acres (33,217 ha).
Map of Castlereagh, Co. Roscommon, Ireland
It contains five civil parishes: Ballintober, Baslick, Kilkeevin, Kilcorkey, and Kiltullagh; including the towns of Ballinlough, Bellanagare, Castlerea, and Cloonfad.
References
Castlereagh (County Roscommon barony) Wikipedia(Text) CC BY-SA