It is the kind of feature that reveals itself more clearly from the air than from the ground, the low banks that define its perimeter blending into the damp grass around them. What makes it quietly compelling is not the enclosure itself in isolation but what surrounds it: a holy well known as Tobercrummeen lies just ten metres to its south-south-east, and a penitential station, a place where acts of religious penance were once performed, stands some 200 metres to the north-west. The clustering of these three features suggests this corner of Lackan once held some significance that went well beyond ordinary agricultural use.

The enclosure belongs to a category of monument found across Ireland, where a roughly circular or oval bank encloses a defined interior space. Such enclosures served many purposes over the centuries, from settlement to ritual to land management, and without excavation it is difficult to be precise about function or date. What aerial photography has captured here is a little more than just the outer boundary. There are traces of an internal dividing bank running north-east to south-west across the interior, and a possible hut site is discernible in the southern quadrant, suggesting that the enclosed space was not simply an open compound but was organised and, at some point, inhabited or regularly used. Additional earthworks lie to the south-east, though their relationship to the main enclosure is not yet established.