So dense was the scrub growth surrounding it that an inspection that year had to be abandoned entirely, leaving the structure unexamined and, in practical terms, unverifiable. The church sits approximately twenty-five metres north of the Owenmore River, on ground that drops sharply through heavy woodland toward the water below.

The townland of Killeennashask takes its name from this church, a common pattern in Irish placenames where the word "kill" derives from the Early Christian Latin "cella", referring to a monastic cell or small church. By the time the Ordnance Survey produced its six-inch maps in 1838, the building was already noted as a ruin, described as a simple rectangular structure. When the same area was mapped again in 1923, something further had changed: the walls of the church had been absorbed into a field boundary running northwest to southeast, with another boundary meeting it at the northwest corner. The ruin had, in effect, been put to work as a convenient divider of agricultural land. A graveyard associated with the site was recorded separately but appears on neither edition of the map. A report from 1937 described the church as small and featureless, offering no ornamental stonework or distinguishing architectural detail to suggest a period of construction or a patron.