On the 1837 six-inch map, it is shown as a neat circular enclosure thick with trees. By 1912, it had become something more ambiguous: a roughly D-shaped outline, its straight southwestern edge running for 33 metres along the boundary between Willowbrook and Doonally townlands, its curved northeastern arc fading in a way that suggests the smaller portion visible in 1837 had already been lost or was simply no longer considered worth marking.

The feature is classified as a tree-ring, a type of designed landscape element associated with demesne planting, in which trees were arranged in a deliberate circular or oval formation, often as an ornamental feature within the grounds of a country house. This one lay within the demesne lands of Willowbrook House, situated about 280 metres to the northwest. The relationship between house and planting was typical of the improving aesthetic common among landowning families in the eighteenth and nineteenth centuries, when formal or semi-formal plantings were used to structure views, mark boundaries, and signal cultivated taste. Aerial photography confirmed the outline of the monument even after it had ceased to be legible on the ground, but local information recorded in the 1989 Sites and Monuments Register file noted that the feature had been levelled sometime during the 1940s. Nothing remains visible at ground level today.

What makes this site quietly interesting is not what survives but what the maps themselves reveal: the slow contraction of a designed feature across a single century, its gradual erasure from one townland's record while a remnant persisted in another, and its final disappearance from the landscape in a decade that saw significant change across Irish rural estates. The 1837 depiction is the clearest record of what it once looked like, a circle of trees on a slight north-facing slope, almost certainly planted to be seen from the house it belonged to.