It cannot be seen from the ground in any meaningful way; what reveals it is the differential growth of crops over buried features, a phenomenon known as a cropmark. When soil above a filled-in ditch retains more moisture than the surrounding ground, the plants rooted there grow taller and darker, tracing the outline of whatever once lay beneath. In this case, an aerial photograph taken in July 1989 captured just such an outline, a circle defined by a fosse, which is simply a ditch, most likely dug to demarcate or protect a small enclosed space of some kind.

What makes the Connahy landscape particularly striking is not the enclosure in isolation but the density of similar features clustered around it. The same general area contains a ringfort, a type of circular earthwork that served as a farmstead enclosure during the early medieval period, typically between the fifth and twelfth centuries, along with several further enclosures and ring-ditches. Ring-ditches are circular or near-circular ditched features that often mark the sites of prehistoric burial monuments, their original mounds long since ploughed flat. A field system has also been recorded nearby. Taken together, this concentration of overlapping features suggests a landscape that was actively shaped and reshaped by human activity across a considerable span of time, with different communities leaving their marks in ways that only become legible from the air.