The oval earthwork at Ballynevin, measuring roughly 29 metres north to south and 22 metres east to west, was defined by a scarp, the kind of low stepped edge formed when a bank or boundary is cut into rising ground. By the time anyone thought to formally record it, the feature had already been levelled, surviving only as a faint impression beneath pasture and as an outline on the 25-inch Ordnance Survey map, where it was captured before the land was worked smooth.

What the map preserves is a site that sits within a small cluster of related earthworks. A second levelled enclosure stood approximately 100 metres to the east, and a possible further enclosure lies immediately east of the main site. Enclosures of this kind, broadly circular or oval earthworks defined by banks, ditches, or scarps, are among the most common prehistoric and early medieval monument types in Ireland, used variously as farmsteads, stock enclosures, or ceremonial spaces depending on date and context. At Ballynevin, the ridge-top position suggests the location was chosen deliberately, though without excavation the purpose and date of the enclosure remain open questions. The grouping of two or three such features in close proximity is not unusual and sometimes points to a landscape that was repeatedly used or settled across different periods.