Where the soil lies thin over buried stonework or ditches, crops grow differently, and from above a field of wheat or barley can suddenly reveal the ghostly outline of something that has not been visible at ground level for centuries. That is exactly what happened in a field on a south-east facing slope at Westown in County Dublin, where a square-shaped enclosure, roughly 28 metres across on its north-east to south-west axis and 26 metres on the north-west to south-east axis, appeared in aerial imagery as though someone had simply drawn it there.

The site was first identified by Anthony Murphy, who spotted it on Google Earth imagery captured on the 24th of June 2018. Square or rectilinear enclosures are comparatively rare in the Irish archaeological record, which is dominated by the circular forms typical of ringforts and similar earthworks, so the geometry here is of some interest in itself. The enclosure sits in tillage land, meaning it survives not as a raised earthwork but as a cropmark, the buried remains affecting the growth of whatever crop is in the field above. Notably, it does not sit in isolation. A second, distinctly oval cropmark enclosure lies just 65 metres to the south-west, suggesting this part of Westown may preserve traces of more than one phase or type of past activity, though no excavation has been carried out to date and any interpretation remains provisional.

Because the enclosure is only visible as a cropmark, there is nothing to see on the ground in the conventional sense. The field itself is private agricultural land, and conditions for viewing cropmarks from the air are specific, typically requiring a dry spell in late spring or summer when moisture stress on the crop makes the subsurface differences most legible. The most practical way to examine the site is through aerial imagery platforms, where the square outline can be traced against the surrounding crop. For anyone curious about the broader landscape, the proximity of the oval enclosure nearby makes this corner of north County Dublin worth examining across whatever imagery is available, even if a visit to the field itself would reveal little more than an ordinary working tillage slope.