The enclosure is entirely levelled, its oval outline some 120 metres north to south and 100 metres east to west, visible not to the eye on the ground but only from the air, where soil discolouration and cropmarks betray a buried landscape that centuries of farming have otherwise erased. What aerial photography has revealed is considerable: a bank, two concentric fosses (ditches encircling a defended or sacred area), a smaller circular enclosure of roughly 35 metres diameter sitting slightly off-centre within the larger oval, and four field boundaries radiating outward from the whole like spokes, suggesting the site once organised the land around it in ways typical of an early Irish monastic or ecclesiastical foundation.

The medieval Irish text Crichad an Chaoilli, published by Power in 1932, names the place as Cill Fhada, the burial ground of the tuath, or local territorial community, of Magh Finne, and records that it was a figure called Mochaemoc Mac Congairb who blessed the church there. The same source describes the original enclosing fence as being of earth and estimates that the space it enclosed amounted to about four acres, characterising it as a kind of saucer-like depression on an elevated site. That description fits what aerial photography now confirms: a broad, shallow earthwork platform, its interior subdivided by boundaries that still showed on Ordnance Survey six-inch maps recorded in 1842, 1905, and 1937, long after any memory of their ecclesiastical origin had likely faded. Killadda church and graveyard, which survive in the north-east quadrant of the old enclosure, are the only above-ground remnant of what was once a considerably more complex sacred landscape.