It was only picked up during an ASI aerial photographic survey in 2002, when a set of survey images revealed its outline clearly from the air. The surrounding pasture sits at around 77 metres above sea level, while the hill itself reaches just over 101 metres, which is enough of a rise to give the enclosure commanding views across flat ground in every direction.

An enclosure, in the Irish archaeological sense, is a defined area bounded by an earthwork, bank, ditch, or natural feature, and can date to any period from the prehistoric through to the medieval. What makes the Boskill example particularly interesting is the layering of landscape history legible within it. Two relic north-to-south field boundaries survive inside the monument, along with a further east-to-west boundary, suggesting the interior was subdivided and worked at some point after, or perhaps alongside, the enclosure's original use. The eastern edge of the site follows an old road that has long since fallen out of use, and the eastern boundary also aligns with the historic townland division between Boskill and Garryduff. The south-eastern edge is shaped by a steeply sloping rock outcrop, meaning the builders were working with the natural topography rather than imposing a purely geometric form. A second enclosure sits around 200 metres to the north-east. The record was compiled by Edmond O'Donovan and uploaded in September 2020.

Because the enclosure shows no surface trace visible to a casual walker, aerial imagery is the practical way to appreciate its form. The outline is visible on OSi orthoimages from 2005 to 2012, on Digital Globe photographs taken between 2011 and 2013, and on Google Earth imagery including a capture from June 2018, so a comparison of those layers before visiting will orient you considerably. On the ground, the sharpest physical indicator is the break in slope at the northern end, where the hillside drops away more abruptly than the surrounding gradient would suggest. The disused road along the eastern edge is another useful marker, and the rock outcrop in the south-east corner is the most immediately tangible feature once you are on site.