No earthwork rises from the turf, no stones mark the perimeter, and the ground offers no visible hint of what may have been there. What is known comes almost entirely from a single cartographic appearance: the 1920 edition of the Ordnance Survey map, which recorded an arc of hachures, the fine lines surveyors used to indicate slopes or raised features, curving from south to north-east across a span of roughly thirty to thirty-five metres. That arc, if it traces what it appears to trace, may represent the north-western half of a roughly circular enclosure, the kind of boundary feature found widely across early medieval Ireland, often used to define a farmstead, a burial ground, or a place of some local significance.

What makes this site particularly elusive is its complete absence from the earlier 1838 Ordnance Survey six-inch map. Either the feature was not yet visible or legible to the surveyors of that period, or it had not yet been identified as noteworthy. By 1920, something had been recorded, but by the time of any modern ground inspection, that something had vanished entirely. The ridge position is consistent with the kind of site selection seen in early enclosures across Connacht, placed where the ground falls away sharply to the east and long views over undulating farmland were available, suggesting deliberate positioning rather than accident. But without surviving earthworks, excavation records, or any supporting documentary evidence, the enclosure at Lurga remains a cartographic ghost, present in one map edition and nowhere else.