Roughly fifteen metres in diameter, it is the kind of feature that reveals itself most clearly not to the person walking the field, but to someone looking down from above. It does not appear on the Ordnance Survey six-inch map produced in 1840, which means either the surveyors missed it or, more likely, it had already sunk so fully into the landscape that it registered as little more than a slight variation in the turf.

The site came to wider attention in a fairly prosaic way. In November 1984, aerial photographs were taken along the route of a Bórd Gáis Éireann gas pipeline, the Curraleigh West to Limerick section, and among the images captured was what surveyors noted as a possible earthwork at Lackendarragh. An enclosure, in this context, refers to a roughly circular area enclosed by an earthen bank or ditch, the kind of feature associated broadly with early medieval settlement in Ireland, though the term covers a range of uses and periods. This particular example is small, with a diameter of around fifteen metres, placing it at the more modest end of the scale. A second enclosure sits approximately sixty metres to the south, suggesting this part of the Knockmagh slope may once have supported more activity than the present quiet pasture implies. The site sits about 370 metres west of the townland boundary with Anglesborough, a detail that anchors it in the local administrative geography even if the enclosure itself predates such boundaries by many centuries.

Because the feature is not prominently marked and lies in working agricultural land, it is best approached through satellite imagery before any ground visit. The circular form is visible on Digital Globe orthoimages taken between 2011 and 2013, and on Google Earth, where the slight differentiation in vegetation that traces the old earthwork is clearest in certain seasons, particularly when the grass is short or growth is uneven. Anyone curious enough to look for it on the ground should bear in mind that what they are looking for is subtle, a gentle undulation rather than a dramatic earthwork. The companion enclosure to the south is worth locating as well, since the two together suggest a pattern rather than an isolated accident of topography.