Roughly twenty metres across and in fair condition, it has two conjoined stone huts built along its northern perimeter, measuring four and six metres in diameter respectively. At some point, those huts stopped being whatever they originally were and became sheep pens, a practical reuse of old stonework that is common enough in the west of Ireland but which here obscures a potentially more interesting history.

The Irish place-name recorded in nineteenth-century Ordnance Survey correspondence offers a suggestive thread. The letters, compiled by M. O'Flanagan and published in 1927, refer to a spot on the north side of the island called Caibidil na mbrathar, which translates roughly as the Chapter of the Brothers, a phrase with clear ecclesiastical overtones. A chapter, in monastic usage, was the formal gathering of a religious community, and "na mbrathar" points to friars or brothers of some kind. Whether the enclosure and its huts are the physical remains of that named spot is unconfirmed, but the coincidence of location and the subcircular form, a shape associated with early Irish monastic enclosures, makes the possibility worth taking seriously. Subcircular or curvilinear enclosures of this type, defined by a stone or earthen boundary wall, were a characteristic feature of early medieval religious settlements along the Atlantic seaboard.

Cruagh Island lies off the Connemara coast, and the site had not been directly inspected at the time it was recorded, meaning the description rests on remote observation and local knowledge supplied by M. Gibbons. The huts and enclosure wall are described as being in fair condition, suggesting the stonework remains legible, but the sheep-pen reuse means some original features may have been altered or obscured over time.