Man-made underground passage in Clonmacnoise

Man-made underground passage identified in 1987 survey of the Clonmacnoise area (McDonald 1987, 7). Not visible at ground level. The above description is derived from the published 'Archaeological Inventory of County Offaly' (Dublin: Stationery Office, 1997). In certain instances the entries have been revised and updated in the light of recent research. Date of upload: 23 May 2011