It measures just 5.8 metres across and rises no more than 25 centimetres at its highest point, an irregularly shaped smudge in the ground that most walkers would step over without a second thought. Yet this modest deposit is the physical residue of prehistoric activity, the kind of site that accumulates meaning once you know what you are looking at.

This is a burnt mound, a type of monument found widely across Ireland and Britain, typically dating from the Bronze Age. The standard interpretation is that these sites were used for heating water, most likely by building a fire, heating stones in it until they cracked from thermal stress, and dropping those stones into a water-filled trough or pit. The superheated stones would bring the water rapidly to the boil, after which they were discarded in a heap alongside the trough. Repeated over time, that heap becomes the distinctive mound of shattered, fire-reddened stone and dark, charcoal-rich soil that survives today. What exactly the hot water was for, cooking, bathing, textile processing, or some combination, remains debated. The site at Ballycoony sits in a marshy field close to a stream, which fits the pattern well; water and boggy ground are almost diagnostic of the type. Particularly telling is its proximity to a second, closely related site, a fulacht fia, the Irish term commonly used for the trough or cooking pit component of this kind of activity, located roughly 60 metres to the west. The two features together suggest a locale that was returned to and used repeatedly, perhaps across generations.