What survives is a semicircular earthwork, roughly eighteen metres across its longer axis and eight metres on the shorter, defined along its south-eastern edge by a scarp that still rises to about one and a half metres. A road forms the natural limit to the north-west, which may explain why the feature was never entirely levelled or absorbed into the working landscape around it.

The precise function of the earthwork is not recorded, and that ambiguity is part of what makes it quietly interesting. Earthworks of this general character in County Cork can represent the eroded remains of a ringfort, a field boundary of considerable age, or something less easily categorised. What adds another layer to Reenroe is the presence, to the south-east, of a possible standing stone. Standing stones in Ireland are among the most persistent and least understood of early monuments, raised from the Neolithic through to the early medieval period for purposes that may have included burial markers, boundary indicators, or ceremonial functions. Whether the stone and the earthwork belong to the same phase of activity is an open question, but their proximity in the same small stretch of pasture suggests the area carried some significance to the people who shaped it.