What makes this one quietly interesting is precisely how little of it remains. The site is classed as a rath, a ringfort defined by earthen banks and ditches rather than stone, and what can now be made out is a subcircular shape measuring roughly 24 metres east to west and 21 metres north to south. The boundary is no longer a standing bank but a degraded scarp, meaning the earthwork has slumped and eroded to the point where it reads more as a subtle change in slope than any obvious raised feature.

Raths of this kind were built in their thousands across Ireland during the early medieval period, broadly between the fifth and twelfth centuries, and they typically enclosed a household, its animals, and associated outbuildings within a raised earthen ring. Their elevated positions, as here on a hillock summit, were not always about defence. Height offered drainage, visibility, and a certain social legibility in the landscape. The specific history of this particular enclosure at Coillín An Léana is not documented, and no associated finds or structures are recorded. Its dimensions place it at the smaller end of the rath spectrum, suggesting a modest agricultural household rather than a site of any unusual status.