A low earthen scarp curves gently from south-west to north-west across the ground, roughly twenty to twenty-five metres long, rising to about one and a half metres high across a slope width of three and a half metres. Stones are worked into its fabric here and there, particularly along the top. It is classified as an enclosure, meaning it was likely once intended to describe a closed boundary, the kind of roughly circular or oval earthwork that appears across Ireland in various forms and periods, sometimes serving as a farmstead boundary, sometimes as something older and less certain in function. The difficulty here is that the arc never convincingly closes. There is no evidence at ground level that it ever continued eastward or southward to complete a full circuit, and the scarp itself may simply be following a natural contour in the undulating terrain rather than asserting an entirely deliberate line.

What sharpens the puzzle is the cartographic record. The site does not appear at all on the 1838 Ordnance Survey six-inch map, which was among the most methodical surveys of the Irish landscape ever undertaken. By the 1916 edition, however, it is marked as a shallow hachured arc, a draughtsman's shorthand for a slight earthen rise, with a recorded cord length of around thirty-five metres, its north-western end intersecting with an east-west field boundary. Whether the feature was simply missed in 1838, or whether it had become more legible by 1916 through changes in vegetation or land use, is not clear. Adding to the uncertainty is an oblong mound sitting approximately five metres to the east of the scarp, measuring roughly twelve metres east-west and three to four metres north-south, standing less than a metre high. Its significance is genuinely unknown. A separate, recorded enclosure lies about one hundred metres to the north-west, which at least confirms that this part of Mayo preserves more than one episode of early activity, even if the relationship between them remains unreadable.