aerial view of lough doon between portnoo and ardara which is famous for the medieval fort - county donegal - ireland.

lough doon portnoo water ardara ring staige boyles conor destination dun aileach national follies way crannog century crianan site aengus round bawan heritage refuge donegal travel construction wall sea stone monument county ancient island atlantic defense wild dry stronghold fort loch walls aerial landmark military lake o castle 5th