The monument consists of a raised circular platform, roughly 35 metres across at its base and 19 metres at the top, with a distinctive dished interior enclosed by an earth and stone bank. Around the base of the hill runs a shallow fosse, or defensive ditch, with its own external bank; a classic defensive arrangement that hints at the site’s strategic importance. The summit itself features a poorly preserved bank enclosing a bowl-shaped area about 15 metres in diameter, with a narrow gap on the north-northeast side where a path leads down the embankment, though this may simply be a later addition created by livestock.

The exact nature of this monument remains something of a puzzle for archaeologists. It could be the remains of a platform ringfort, a type of defended farmstead common in early medieval Ireland, or possibly an Anglo-Norman ringwork castle dating from the 12th or 13th century when the Normans were establishing their control over the Irish midlands. Its position is certainly deliberate; just 325 metres to the northeast stands the medieval parish church of Killulagh, which itself may have been built on the site of an early Christian monastery founded by St. Lonán. A prehistoric mound barrow lies 155 metres to the north-northwest, suggesting this area has been significant to local communities for millennia.

The monument’s boundaries are particularly interesting, as they follow natural and administrative divisions that may be quite ancient. A stream marking the townland boundary flows just 40 metres to the west and northwest, whilst a field fence delineating the border with Williamstown townland cuts across the eastern side of the site. These boundaries often preserve medieval or even earlier territorial divisions, adding another layer to the site’s complex history. The Archaeological Survey of Ireland has documented and surveyed the monument, creating a detailed profile that helps us understand its original form despite centuries of weathering and agricultural activity.