It is not set upright or given any formal prominence; it lies flat on the ground, functioning simultaneously as a cross-slab and as a boundary stone for the well beside it.

The slab, which measures roughly 0.48 metres by 0.46 metres with a thickness of 0.13 metres, carries an incised ringed cross, the kind of early medieval design in which a circle intersects the arms of the cross. Here the cross is rendered in double lines with hollowed angles, meaning the spaces where the arms meet the ring have been carefully scooped out, giving the design a sculptural precision that rewards close looking. Ringed or encircled crosses of this type appear widely in early Christian Ireland, used on slabs, pillars, and grave markers as a portable shorthand for devotion. This particular example sits about 150 metres south of Kilnamona church, in a low valley floor, associated with a holy well. Holy wells, springs or water sources venerated for their supposed curative or spiritual properties, were often marked with simple stone crosses or slabs, a practice that blended pre-Christian reverence for water sources with Christian iconography. The pairing of the slab and the well here suggests that boundary and blessing were understood as the same gesture.