It occurs to me that the term ‘Hollow Hills’ may not be a landscape but rather a mind-scape description…
‘…The landscape of Cavan is dotted with drumlin hills but there are also many lakes and the drumlins form wooded islands creating areas of half water, half land… marshy, boggy terrain which is not easy to cross.
Perhaps because of this, Cavan has more secrets than most counties and some interesting places.
Its name is thought to survive in the parish of Tomregan which includes the town of Ballyconnell within its boundaries.
In the grounds of the Church of Ireland church there is a stone called ‘the Tomregan stone,’ which is said to depict St Bricin, founder of the university, performing an operation.
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