Its stone-walled enclosure measures about 70 metres east to west and 55 metres north to south, and its outline reflects centuries of incremental expansion: a triangular corner was added to the west in 1773, with further extensions to the south-west in 1905 and 1935. Inscribed headstones here go back to the 1720s, and the ground is still in use for burial, which means the earliest stones share the same enclosure as comparatively recent ones.

The Church of Ireland church standing at the northern end of the graveyard was built in 1812, most likely on the site of an ancient parish church of Killeagh. It is a plain rectangular structure, with twin-light windows set into both the north and south walls, a battlemented tower at the west end, and a very shallow chancel at the east end fitted with an early-Gothic style window that was added around 1873. The roof remains intact, though the building is no longer in religious use. Immediately to the south of the church, a 1934 Ordnance Survey map marks the site of St. Abban's Nunnery. Writing in 1750, the historian Charles Smith recorded that the place once held an ancient nunnery of canonesses, founded by St. Abban in the sixth century. A nunnery of canonesses would have been a house of women living under a rule but without the full monastic enclosure of later traditions, a form of early Irish religious community that largely disappeared after the medieval reforms of the twelfth century. A competing tradition complicates the picture further: a separate body of opinion, noted by Henchion in 1972, holds that the first church on the site was not Abban's work at all, but was instead raised by a figure named Id or Liber, said to have been a disciple of St. Finbarr of Cork. No visible surface trace of any early structure survives to settle the question one way or the other.