On the highest point of Church Island, which lies c. 200m offshore at the North end of Lough Derg. The island was probably once part of the demesne lands of the ruined 19th-century house located on the mainland. The church which is poorly preserved is constructed of a mixture of large and small randomly coursed and mortared limestone. Apart from a few dressed and squared quoin stones on the SW and NW corners, no other dressed stonework is visible. The masonry and surviving quoin stones suggest a late medieval date.