It does not announce itself with earthworks or stonework or any surface feature that a walker would notice. What gives it away is the grass above it, which in the right conditions grows differently over disturbed or buried ground, producing what archaeologists call a cropmark: a faint shadow of the past made legible only from the air.

The enclosure at Dermotstown came to attention through a Google Earth orthoimage captured on 21 July 2021, in which a circular cropmark roughly 29 metres in diameter is clearly visible. The record was compiled by Caimin O'Brien, working from details provided by Jean-Charles Caillère, and uploaded to the record in November of that year. Cropmarks of this kind typically form during dry summers, when buried features such as ditches or walls affect how much moisture the soil retains. Crops or grass above a filled-in ditch tend to grow taller and greener, while those above buried stone or compacted ground often show as paler, shorter growth. Circular enclosures in Ireland span a wide chronological range, from prehistoric ring ditches to early medieval ringforts, the latter being the most common type of rural settlement in Ireland between roughly the fifth and twelfth centuries. Without excavation, it is not currently possible to say which period this particular feature belongs to, or what activity once took place inside it.

The site itself is not physically accessible in any formal sense; there is no marker, no signage, and no publicly managed access point. The enclosure exists, for now, as a feature in an aerial photograph rather than a place one can stand in and interpret on the ground. Those interested in cropmark archaeology more broadly may find it worthwhile to explore the wider Dermotstown area using publicly available satellite imagery, where the circular outline can be seen in the 2021 image. The best conditions for spotting such features in aerial photographs tend to follow prolonged dry spells in late summer, when the differential growth patterns are most pronounced. What lies beneath the soil at Dermotstown remains, for the moment, a question rather than an answer.