A stone circle? A burial mound? Something in between? The question is not merely academic. The structure, roughly ten metres across and standing about ninety centimetres above the surrounding field, is edged with a kerb of contiguous limestone slabs, most barely projecting above the grassy platform they enclose. It sits about twenty metres south-south-east of a large embanked stone circle and has, over the years, been catalogued under at least two different identities.

When T. Crofton Croker noted the site in 1833, he counted it as one of three stone circles on Knockroe, labelling it 'N3' and recording a diameter of roughly twenty-six metres, though later measurements settled on ten metres, suggesting some early confusion about which features were being measured. By 1912, Windle was calling it 'Stone Circle P' and noting two recumbent stones lying to the west, their alignment bearing roughly 233 degrees from the centre of the platform. He observed that the structure resembled the central portion of the larger circle nearby, though without any double ranking of stones. It was O'Kelly, writing in 1944, who shifted the interpretation most decisively, describing it as a flat-topped mound with a stone kerb and no entrance, and reporting that excavation had uncovered two Bronze Age burials contained in pottery urns. By 1978, O'Kelly and O'Kelly were raising the possibility that it might be a kerb-cairn, a type of funerary monument with parallels in Wales and Scotland, in which a low cairn, essentially a deliberate pile of stones covering a burial, is defined by a neat outer ring of kerbstones. The upper portion of this example, they suggested, may have been robbed out over time, perhaps into an adjacent field boundary.

The monument is recorded as National Monument No. 247 and is visible on aerial photography as a clearly circular feature. It lies on the Hill of Knockroe in the broader Loughgur landscape, an area dense with prehistoric remains. Visitors exploring the hill should look for the low, grass-covered platform with its edging of limestone slabs, modest enough that it could easily be passed without a second glance. The two recumbent stones to the west of the platform are worth locating separately. The site is most legible in low winter light or after a dry spell when the slight elevation of the interior above the surrounding field becomes more obvious underfoot.