It is neither. The mound is all that remains of a lime kiln, a structure that once served a very practical agricultural purpose, and its survival, however battered, inside a dense block of commercial forestry gives it a quietly strange quality, as if the plantation grew up around it deliberately, enclosing something the surrounding farmland had long forgotten.

A lime kiln was essentially a stone-built furnace used to convert limestone into quicklime by burning it at high temperatures. The resulting material was spread on fields to reduce soil acidity, and kilns of this type were common features of the Irish rural landscape from the seventeenth century onward, often built close to local limestone outcrops. The Carrigeen example appears on the 1840 edition of the Ordnance Survey Ireland six-inch map, which confirms it was a functioning or at least recognisable structure at that date. What survives today is the collapsed shell of that kiln, now presenting as an earth and stone mound measuring roughly 4.4 metres north to south and standing about 2 metres high, with a wider base footprint of just over 8 metres in both directions. The opening to the west, where the kiln's draw arch would once have allowed fuel and air to feed the fire, is now readable mainly as a concave break in the mound's profile, giving it the appearance of something that has been partially quarried away. The record was compiled by Caimin O'Brien and uploaded in October 2021.

Accessing the site requires navigating into the coniferous plantation itself, which means visibility and underfoot conditions will depend heavily on how the forestry is being managed at any given time. Dense planting can make orientation difficult, and the mound is not signposted or formally presented in any way. The crescent shape is the key thing to look for once you are close; seen from above on satellite imagery it is reasonably legible, and that view is worth consulting before a visit to get a sense of the mound's orientation relative to the tree rows. The opening faces west, so approaching from that direction gives the clearest read of the structure's original form.