It measures roughly eleven metres east to west and just over seven metres north to south, rising to about a metre in height, with a westward-facing opening a little over two metres wide. A stream runs along the eastern arc of the mound, which is partly exposed at the south-west and at its base. There is no signpost, no enclosure, no marker of significance. It sits in a sheltered hollow as it has sat, more or less, for several thousand years.

This is a fulacht fia, a type of prehistoric cooking site found in great numbers across Ireland, most commonly dating from the Bronze Age. The typical arrangement involved heating stones in a fire, dropping them into a water-filled trough until the water boiled, and using the resulting heat to cook meat or process other materials. The crescent or horseshoe-shaped mound that remains is the accumulated debris of those heated and shattered stones, which crack and fragment when quenched repeatedly and become useless for further heating. The presence of a stream so close to this example at Garries is consistent with the pattern seen at fulachta fia across the country; access to running water was a practical necessity for the process. The sheltered hollow on the valley slope would have offered some protection from wind, and the east-facing aspect would have caught the morning light, though whether such details were deliberate choices or simply convenient is impossible to say at this distance.