Six metres across and less than a metre high, it has a shallow central hollow at its crown, and in that depression, irises have taken root. The whole thing looks, at a casual glance, like a natural rise in the ground, perhaps a slight geological quirk of the waterlogged landscape. In fact, it is almost certainly the remains of a lime kiln, a structure once used to burn limestone at high temperatures to produce quicklime, which farmers spread on fields to reduce soil acidity and improve fertility.

What makes this particular example quietly puzzling is its absence from the Ordnance Survey six-inch maps of 1837 and 1913, both of which recorded the Irish landscape in considerable detail. It only appears on the later twenty-five-inch plan, marked as a small circle with the annotation "L.K.". Whether it was simply overlooked by earlier surveyors, or whether the feature had not yet taken its current form by the time of those earlier surveys, is unclear. The mound appears to be of earthen rather than stone construction, which is itself slightly unusual for a lime kiln, a structure that in most Irish examples involves a stone-lined bowl or draw-hole. About a hundred metres to the west lies a moated site, a type of medieval enclosure typically consisting of a raised platform surrounded by a water-filled ditch, suggesting that this corner of Sligo carries several layers of past use, each sitting quietly alongside the others in the damp pasture.