It measures roughly four metres across in either direction, its boundary wall now grassed over and barely distinguishable from the surrounding terrain. A faint break in the eastern arc suggests where an entrance once was. The structure was recorded as a Penitential Station, a designation that immediately raises questions about what exactly happened inside it.

A Penitential Station, in the context of Irish early Christian practice, was a place set aside for acts of physical or spiritual penance, often involving prayer circuits, prostrations, or prolonged exposure to the elements as a form of devotional hardship. High Island, known in Irish as Ard Oileán, was home to a monastic community, and the presence of such a station in close proximity to the ecclesiastical remains points to a tradition of severe ascetic observance. Michael Herity, who recorded the site in 1977, classified it within this framework, though the structure itself has no confirmed date. The subcircular form, defined by a dry-stone wall that has since sunk into the earth, places it somewhere within a long continuum of simple enclosures associated with early Irish monasticism, where the boundary between a dwelling and a place of ritual was often deliberately blurred. Its position between two lakes, south of the main monastic complex, may itself have carried some intentional meaning, water being a recurring element in the geography of Irish penitential landscapes.