This is a bullaun stone, a type of ancient carved or naturally shaped rock bearing one or more cup-like depressions, found at ecclesiastical sites across Ireland and often associated with early Christian activity, though their origins and precise purpose remain genuinely uncertain. The Lissonuffy example is modest in scale, measuring roughly 0.8 metres by 0.6 metres and standing just 0.3 metres high, with a single basin some 0.4 metres across and 0.2 metres deep. That basin is the point of it. Water collects there, and for centuries such collected water was regarded as having curative or protective properties.

The stone sits within a rectangular graveyard enclosing the remains of the church of Lissonuffy. Rectangular graveyards of this kind are a fairly common feature of early Irish ecclesiastical sites, their shape often reflecting the original boundaries of a monastic or parish enclosure laid out in the early medieval period. The co-location of a bullaun stone with a church and burial ground is equally typical; these stones seem to have functioned within a landscape of local devotion, positioned where people already gathered for prayer, sacrament, and burial. The church itself is the older presence here, and the bullaun stone belongs to that same layered accumulation of religious use across many generations.