Crannog, Derreenahinch, Co. Roscommon

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Settlement Sites

Crannog, Derreenahinch, Co. Roscommon

In Lough Skean, a modest lake in County Roscommon stretching roughly a kilometre east to west, there sits a small overgrown island that has been classified as a crannog, the term for an artificial or semi-artificial island dwelling used throughout Irish prehistory and the early medieval period.

The curiosity here is that this particular example appears not to be artificial at all. No evidence of deliberate construction has been found, which places it in an ambiguous category: an island that looks the part, sits in the right kind of lake, bears the right general shape, but may simply be a natural feature that has accumulated a reputation by association.

The island is subcircular, measuring about 28 metres east to west and 23 metres north to south, with a raised interior platform of stones and earth sitting between half a metre and just under a metre above the surrounding level. That interior measures roughly 16.5 metres by 13.5 metres, a footprint not unlike what you would expect from a genuine crannog. The site lies about 80 metres from the southern shore of the lough. Whether the raised stony mound is the remnant of something once built, or simply a natural glacial or geological deposit that was later interpreted as a dwelling site, remains an open question. The absence of evidence for artificial construction does not entirely rule out early use, but it does mean the site cannot be straightforwardly read as an inhabited island in the way a confirmed crannog would be.

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Pete F
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