But the mound at Cabraghkeel has a quiet anomaly worth noting: when the Ordnance Survey produced its meticulous 6-inch mapping of Ireland in 1837, this feature went unrecorded entirely. That omission is itself a small puzzle. The OS surveys of that period were thorough enough to capture field boundaries, holy wells, and the faintest earthwork traces, which makes the absence of this mound from the historical record all the more curious.

The mound sits on a gentle rise in low-lying pastureland, with a stream running roughly 60 metres to the north. In shape it is oval, measuring approximately 22 metres north to south and just under 11 metres east to west across its flattened top. It is composed of both earth and stone, and its surface tilts slightly downward from west to east. Mounds of this general character in Ireland can represent a wide range of origins, from prehistoric burial cairns to the remains of later settlement activity, though nothing in the available record assigns Cabraghkeel definitively to any particular period or function. That ambiguity is part of what makes it interesting; it sits in the landscape as an unresolved question.