Known variously as Teampall Mhanacháin or Teampall Geal, the site holds not just the oratory itself but a burial ground, cross-inscribed grave markers, two cross-slabs, miscellaneous carved fragments, and an ogham stone, ogham being the early medieval script in which letters are represented by notches and strokes cut along a central line, that now stands on a modern platform directly in front of the building. One cross-slab recorded by the scholar Macalister has since disappeared entirely, a small, quiet loss absorbed into the general weathering of the place.

The oratory is a drystone structure, meaning it was built without mortar, measuring roughly 3.35 metres north to south and 4.4 metres east to west internally, with walls up to 1.6 metres thick. It no longer has its corbelled roof, a technique in which successive courses of stone are stepped inward until they meet at the top, and sections of the north and east walls have been largely rebuilt. What survives intact is still legible: the west gable stands to 2.75 metres and retains a central lintelled doorway whose slightly inclined elevation suggests considerable age; two broken pivot stones survive above the doorway head, remnants of the original hanging mechanism. An undecorated stone finial has been restored to the west gable, comparable to one recorded at Church Island near Valentia. The east gable, lower at 1.5 metres, preserves a splayed window opening with a stepped sill, the outer sill stone inscribed with a triple-barred linear groove, though this element may be a later refurbishment. Four stones of the interior wall face carry simple incised crosses. The south wall rests on a projecting stone plinth, partly supported by upright orthostats.

The site remained in active devotional use well into the modern era. Children were still being buried in the associated ground during the nineteenth century, and a turas, a traditional pattern or circuit of prayer stations, was performed here on Easter Sunday, taking in the oratory, a place called Poulnasaggart, and the holy well of Tobermanaghan, which lies roughly 150 metres to the south.