Among its most intriguing features is a ring-ditch, a type of circular or near-circular ditch that typically marks the site of a prehistoric burial, often the remains of a round barrow whose central mound has long since been levelled. What makes this particular example quietly arresting is that it can only be read through geophysical survey; to stand on the hillside, you would see nothing at all.

The feature was identified through magnetometry, which detects subtle variations in the magnetic properties of soil disturbed by human activity. It shows up as a semi-circular arc of positive magnetic values, roughly twelve metres in diameter, curving clockwise from the south-west around to the north-east, where it ends in a thickened, bulbous terminal that may indicate a pit. The eastern sector of the circuit is missing entirely, most likely the result of ploughing in recent centuries, which would have gradually destroyed any shallow surviving archaeology in that area. The same agricultural activity may explain why several other potential ring-ditches detected nearby, to the north-west and east, produce only very faint geophysical signatures. The monument sits approximately thirty metres south of a feature known as St Patrick's Bed, and close to two palisaded enclosures, structures defined by rows of upright wooden posts, suggesting this part of the hill was a focus of activity across more than one period. Research by Dr Roseanne Schot, published between 2005 and 2016, brought these overlapping features to light and placed this possible burial monument within the wider ceremonial and political landscape of Ushnagh, long regarded in early Irish sources as a significant ritual centre.