The remnants measure roughly 5 metres by 3.5 metres and rise just half a metre high, with some stones still bearing traces of ancient mortar. These ruins sit partially enclosed by field walls; a straight section to the east and a curving wall that sweeps from south to west, creating a sense of the original sacred boundary that once defined this space.

Beyond the curving field wall to the north, archaeological investigation has revealed something potentially more significant: a 12-metre stretch of foundation stones that may represent an earlier, larger enclosure. If complete, this circular feature would have measured approximately 40 metres in diameter, suggesting this site held religious importance long before the church itself was built. The land here slopes naturally from north to south and east to west, following the gentle contours of the Donegal landscape.

Today, the site lies concealed beneath overgrowth, its stones scattered amongst rock outcrops in this quiet corner of the county. The archaeological evidence, whilst fragmentary, hints at centuries of religious use at this location, from what may have been an early Christian ecclesiastical enclosure to the later church that gave the townland of Killydesert its name. The prefix ‘Killy’ derives from the Irish word ‘cill’, meaning church, a common element in Irish place names that often points to ancient religious sites now lost to time.