The enclosure at Knockannacreeva is not visible as a standing monument; there are no walls, no earthworks obvious to the casual eye. What survives is a cropmark, the ghost of a circular platform roughly 31 metres north to south and 32 metres east to west, legible from the air when variations in soil moisture or crop growth betray the buried edges of what was once a defined and deliberate space.

The site has a quietly complicated documentary history. It does not appear on the Ordnance Survey's first six-inch map, surveyed around 1840, which suggests it was either already too degraded to record or simply overlooked by the surveyors of that era. By the time the more detailed 25-inch edition was published in 1897, it was mapped as a circular-shaped platform defined by a scarp, a low slope or edge marking the boundary of a raised or levelled area. What function such an enclosure originally served is not recorded in the available notes; circular enclosures of this kind in the Irish landscape can range from prehistoric to early medieval in date, and are often associated with settlement, ritual, or agricultural use. The surrounding landscape adds texture: a holy well dedicated to Saint Patrick lies roughly 140 metres to the south-west, and a ringfort, the remains of a circular farmstead typical of early medieval Ireland, sits around 210 metres in the same direction. The site sits 75 metres north-east of a stream that marks the townland boundary with Coolrus.

A field boundary running east to west has cut across the south-east and south-west of the monument, truncating its full circle, so even from aerial imagery the shape is incomplete. The clearest views come from Ordnance Survey orthophotographs taken between 2005 and 2012, and from Google Earth imagery, where the cropmark reads as a partial arc against the surrounding pasture. On the ground, reclaimed poorly drained land of this kind tends to be unremarkable to look at directly; the interest lies in cross-referencing what satellite and aerial images show against the 1897 map depiction. Anyone curious enough to seek out the area would do well to visit in dry summer conditions, when crop and grass differential over buried features tends to be most pronounced, and to arrive with satellite imagery already in hand.