Situated on a low drumlin surrounded by the reclaimed marshlands where the Rivers Deele and Foyle meet, the graveyard preserves fragmentary walls of what was once a church, measuring 6.8 metres wide internally. The surviving sections tell a story of centuries of change: the north wall, standing 4.15 metres high and built from rubble, contains a blocked window with a segmental rear arch, whilst its exterior shows signs of later refacing. The opposing south wall, now incorporated into the graveyard boundary, features a matching blocked window where traces of the original wicker centering can still be spotted on the arch soffit.

Recent conservation work by Donegal County Council has uncovered several intriguing medieval features that had been hidden beneath the soil for generations. Three fragments of carved medieval mouldings have emerged near the church ruins on the eastern side of the graveyard, along with a particularly striking recumbent slab measuring 1.68 metres long. This tapered stone slab bears a deeply carved Maltese cross, 32 centimetres square, with a raised central boss 9 centimetres in diameter; a design that speaks to the site’s long religious significance.

The physical remains at Clonleigh reveal the typical pattern of Irish ecclesiastical sites, where early Christian foundations evolved through the medieval period before gradually falling into ruin. The church’s thick walls, nearly a metre wide in places, and the careful construction details like the splayed window openings demonstrate the skill of medieval builders working in this remote corner of Ireland. Though only fragments remain, these weathered stones continue to mark a place that has been sacred to local communities for nearly fifteen hundred years.