What looks like an ordinary agricultural field from the roadside reveals, when viewed from above via satellite imagery, the ghostly outline of a roughly circular structure some 35 to 40 metres in diameter, its defining fosse, a ditch dug to mark or defend a boundary, showing up as a cropmark where soil moisture retained along the old cut encourages slightly different growth in the vegetation above.

The site was identified and reported by Jean-Charles Caillère, who noticed the distinctive marks while examining satellite imagery on Apple Maps. The enclosure itself is of a curvilinear form, a shape common to early medieval ringforts and enclosed settlements across Ireland, though no excavation has taken place here to confirm a date or function. What makes the Carrigeen example particularly interesting is the broader pattern visible around it. A series of linear cropmarks extending roughly 50 metres on a northeast to southwest alignment appear to the northeast, east, and southeast of the main enclosure, suggesting traces of an associated field system. A second possible curvilinear enclosure appears to be conjoined directly to the south, hinting that whatever activity once took place here was more extensive than a single enclosed homestead.