The opening faces south-west, and the whole thing measures just under thirteen metres along its longer axis and less than a third of a metre in height. Easy to walk past, easy to mistake for a natural rise in the ground, it is the kind of site that rewards a second look.

This is a fulacht fia, a type of monument found in extraordinary numbers across Ireland, typically dating to the Bronze Age. The term refers to a mound formed by the repeated dumping of fire-heated stones, which were used to boil water in a nearby trough. The stones shatter when quenched, and over time the discarded fragments build up into the characteristic horseshoe or kidney shape, with the open end usually facing the water source. Thousands of these sites survive across the country, often clustered near streams or boggy ground, and Ballygrady is no exception to that pattern. What makes this particular field quietly remarkable is the density of the archaeology within it: a second fulacht fia lies roughly two hundred metres to the north-west, and a third sits only about fifty metres to the south-east. Whether the three were in use simultaneously, or represent activity returning to the same favoured ground across generations, is not something the surface evidence can answer.