No wall, no mound, nothing you could trip over; just a faint difference in the way crops grow over disturbed ground, tracing the outline of a ditch that has lain beneath the surface for the better part of two centuries. What reads on aerial imagery as an abstract cropmark was once, in all probability, a ring of trees planted as a deliberate ornamental feature on the grounds of a country estate.

The feature sits on the demesne lands of Foxhall House, about 190 metres to the east of the house itself. A demesne, in the Irish landed estate tradition, was the private parkland kept in the direct use of the landowner rather than leased out to tenants, and it was typically the canvas for landscaping fashions of the eighteenth and nineteenth centuries. Tree-rings of this kind were a recognised element of designed landscapes in that period, planted in a circle over a shallow enclosing ditch to create a formal ornamental grove. By the time the first edition of the Ordnance Survey six-inch map was produced in 1840, this particular ring was already established enough to be recorded as a cartographic feature. What the Victorian surveyors drew as a neat circle of planting has since disappeared above ground, surviving only as a soil disturbance legible to cameras on satellites and in archive aerial photographs taken between 2011 and 2013.