It measures roughly 15.7 metres east to west and 16.6 metres from north-northeast to south-southwest, rising to about two metres in height, with a narrow opening of 1.6 metres facing northwest. What it is made of is what makes it worth pausing over: burnt stone and scorched material, accumulated over what may have been centuries of repeated use.

This is a fulacht fia, a type of prehistoric cooking site found in enormous numbers across Ireland, and particularly common in Munster. The basic method involved heating stones in a fire, dropping them into a water-filled trough to bring it to a boil, and cooking meat wrapped in straw or placed in the water directly. The discarded, fire-cracked stones piled up around the trough over time, forming the characteristic horseshoe shape, with the open end typically positioned near the water source. The mound at Drom Óinigh conforms to this pattern closely, its opening oriented away from the stream that still runs along its eastern edge. That eastern side shows signs of erosion caused by cattle, a reminder that these monuments, though ancient, exist in working agricultural landscapes where they are subject to ordinary and ongoing pressures.