It is a fulacht fia, one of the most common yet least visited categories of ancient monument in the Irish countryside, and it sits beside a drain on the south-eastern edge of a pasture, unremarkable to any eye not already looking for it.

Fulachtaí fia are prehistoric cooking sites, found in their thousands across Ireland and dating most commonly to the Bronze Age, roughly 2000 to 500 BC. The typical arrangement involved a trough, often timber-lined or stone-built, filled with water and heated by dropping fire-cracked stones into it. Those stones, once spent, were discarded into a mound nearby, and it is these characteristic spreads of shattered, heat-reddened material that survive in the landscape long after every other trace of activity has gone. The Gortdonaghmore example is recorded simply as a grass-covered spread of burnt material, its boundaries not yet established by excavation or survey. That uncertainty is itself typical; many such sites are known only from surface traces, their interiors intact and unexamined beneath the soil.