It measures approximately fifty metres north to south and sixty metres east to west, and its presence is betrayed only by a cropmark, the subtle difference in colour and growth that ripening crops display above buried features. Where soil was once disturbed by digging, it retains moisture differently, and in dry conditions that variation shows up in the vegetation above, turning what would otherwise be featureless farmland into a kind of aerial map.

The enclosure is defined by a fosse, a ditch that would originally have ringed whatever lay inside it. Features of this type are found across Ireland in considerable numbers and can belong to several different periods and functions, from early medieval ringforts to prehistoric enclosures to the surrounding ditches of later settlements. What makes this particular example notable is how it came to light: Jean-Charles Caillère identified it through satellite imagery on Apple Maps, with no ground survey required. The northern edge of the enclosure appears to have been cut by a road running roughly east to west, meaning part of the original circuit was lost at some point, probably long before anyone thought to look for it.