It is only ten metres across, enclosed by a bank roughly three and a half metres wide and a corresponding external fosse, which is a defensive or boundary ditch dug around the outer edge of the bank. Small as it is, the geometry is deliberate and the construction is real, and for most of modern history it went entirely unrecorded.

The enclosure at Ballynagranagh came to light not through fieldwork but through the air. The Bruff aerial photographic survey of 1986 captured it as a square-shaped cropmark, the kind of ghost impression that buried or low-relief earthworks leave in dry summers when overlying grass or crops reveal the differential moisture beneath the soil. The survey reference is Bruff 191, image AP 4/3609. Cropmarks of this kind are often the only trace of early enclosures that were never substantial enough to survive as obvious landscape features, and this one had left no mark on any earlier cartographic record. Subsequent satellite and ortho-imagery, including images taken between 2005 and 2013 by the Ordnance Survey Ireland and Digital Globe, and a Google Earth capture from June 2018, confirmed that an upstanding earthwork is still visible on the ground. About 280 metres to the south lies a cluster of contiguous barrows, prehistoric burial mounds catalogued under the monument numbers LI032-289 through to 293, suggesting the broader landscape here carries a deeper archaeology than its drained and improved pasture surface might suggest.

The site lies 105 metres east of the townland boundary between Ballynagranagh and Ballyloundash, which also runs along a main watercourse. The surrounding ground is improved wet pasture, cut through with land drains, so underfoot conditions are likely to be soft and the earthwork itself sits within an actively managed agricultural field. There is no public access arrangement noted, and the monument does not appear on tourist or heritage trails. Those with a particular interest in cropmark archaeology or early enclosures might find value in examining the aerial survey image alongside the Google Earth orthoimage to get a sense of scale and orientation before visiting the general area. The record was compiled by Alison McQueen and Vera Rahilly and uploaded to the national monuments database in November 2020.