The feature at Carriganagh is modest almost to the point of invisibility: a slightly raised circular area roughly six metres across, defined by a fosse, the term used for a shallow surrounding ditch, that is more suggestion than structure. It was only identified as a distinct archaeological feature during a field inspection in September 2006, which is itself a reminder of how much of the Irish countryside has simply not yet been read carefully enough.

What makes the site quietly interesting is its immediate neighbours. Within sixty metres to the south-south-west, and thirty metres to the south-west, lie two ditch-barrows, a type of funerary monument in which a burial mound is encircled by a surrounding ditch. The proximity of this small enclosure to those two barrows raises questions that the physical evidence alone cannot answer. Enclosures of this kind, circular areas defined by a fosse, appear throughout Ireland in a variety of periods and contexts, and without excavation it is difficult to say whether the Carriganagh example is a minor settlement feature, something associated with agricultural use, or a monument with a connection to the nearby burials. The slight raising of the interior, only fifteen centimetres above the surrounding ground, is just enough to indicate that something deliberate was done here, at some point, by someone with a reason.