It is bounded on the north by Carickaleese and Dernagore townlands and on the east, south and west by the international border with County Cavan and the Republic of Ireland.
Its chief geographical features are Cloncoohy Lough, the Shannon-Erne Waterway and a drumlin hill reaching to 60 metres above sea-level.
The map for Knockninny barony stops on the east bank of the stream entering the Woodford river between the townlands of Derryhooly and Corry townlands,[2] while the Tullyhaw barony map stops where the Irish border is now,[3] thus omitting that part of Tomregan parish which lies in County Fermanagh.
[6] A list of apothecaries or pharmacists registered to run a chemist's shop in Ireland includes Edward Reilly of Clincoohy, Fermanagh, who was licensed on 18 November 1814.
[7] The Tithe Applotment Books for 1827 (which spell is as Clincoohy) list the tithepayers in the townland as- Murphy, McKenna, Reilly.