It measures just under twelve metres at its widest and barely reaches sixty centimetres at its highest point on the western end. It is not a burial site or a fort; it is a fulacht fia, a type of prehistoric cooking or heating site found in enormous numbers across Ireland, typically identified by the crescent or kidney-shaped mounds of fire-cracked stone left behind after repeated use. The usual interpretation is that stones were heated in a fire and then dropped into a water-filled trough to bring it to boiling point, the shattered, blackened stones then raked aside to form the mound over time. What makes this particular example part of a larger and more intriguing picture is its setting.

The Carrowgilpatrick mound is not an isolated feature. It sits within a concentration of fulachtaí fia and burnt mounds strung along a flat-bottomed northeast-to-southwest valley over a distance of roughly one and a half kilometres. The marshy ground at the base of a steep slope would have offered a reliable water source, which is precisely the kind of location these sites favour. A second burnt mound lies just eight metres to the south-southwest, close enough to suggest the two were in use around the same period or even simultaneously. The irregular shape and uneven surface of the mound at Carrowgilpatrick are likely the result of later disturbance rather than the original form, which complicates any attempt to read too much into its current appearance. Even so, the shattered sandstone packed into a charcoal matrix records, in a very material way, the accumulated labour of people heating water in this valley over what may have been a considerable stretch of prehistoric time.