The one at Rathclogh, in County Tipperary, sits quietly inside a forestry plantation, its horseshoe-shaped mound rising to just over a metre at its highest point, the open end facing north towards what would once have been its working area.

A fulacht fia, sometimes called a burnt mound, is the accumulated debris of a Bronze Age cooking method. Stones were heated in a fire, then dropped into a water-filled trough to bring the water to a boil; the cracked and fire-shattered fragments were raked out and piled up after each use, gradually building the characteristic curved mound that survives today. At Rathclogh, that mound is substantial, measuring roughly fifteen metres north to south and nearly twenty-three metres east to west, with the mound's lower western edge sitting at around half a metre in height and the eastern side reaching about twice that. A gentle depression at the southern end marks the interior of the horseshoe. The trough area itself, the space where the cooking vessel or pit would have been located, opens to the north and measures more than ten metres across. The site's proximity to a spring well, just four metres or so to the west-northwest, is entirely typical; reliable access to fresh water was a practical necessity for the whole operation, and fulachtaí fia are almost invariably found close to natural water sources.

The forestry plantation that now surrounds the site has been planted right to the monument's northern and southern edges, and to within a few metres on either side, meaning the mound sits in a close, shaded corridor of trees. This kind of encroachment is common with monuments recorded in commercial forestry land, and it can make the archaeology feel oddly compressed, the scale of the mound harder to read than it would be in open ground.