No earthwork, no hollow, no scatter of stones to catch the eye; just ordinary ground, and underneath it, the remnants of what prehistorians call a burnt mound, one of the most common yet least understood monument types in the Irish landscape.

A burnt mound is, in essence, a deposit of fire-cracked stones and charcoal-rich soil, typically associated with the heating of water, though their precise function remains debated. They are found across Ireland in their thousands, usually in low-lying or damp ground near water, and most date to the Bronze Age. The Ballina example came to light in 2017, when archaeological testing was carried out under licence ahead of a proposed development on the site. A test trench cut across a slight natural hollow in an area of damp ground, and at roughly half a metre below the surface, the excavators encountered a layer of charcoal-enriched soil packed with fire-cracked stones. The deposit measured at least ten metres east to west and nearly two metres north to south, though that north-south figure represents only the width of the trench; the full extent of the mound in that direction remained unknown, as the layer continued beyond the trench edge. A geotextile cover was laid over the exposed deposit, and the trench was backfilled, leaving the mound where it had lain, undisturbed again and invisible once more beneath the surface of the field.