4 metres and faced vertically in stone. What makes it quietly arresting is not drama but precision: the bank is flat-topped, roughly two metres wide at its crest, before sloping gradually down toward the interior. It is the kind of structure that repays a slow walk around the perimeter rather than a glance from a gate.

This is a ringfort, the most common monument type in the Irish landscape, an enclosed farmstead of the early medieval period, typically dating from somewhere between the sixth and twelfth centuries. Thousands survive across the country, though many have been ploughed out or degraded over the centuries. The Riddlestown example was recorded and compiled by Denis Power, with notes uploaded to the national record in August 2011. The enclosure measures roughly 34 metres north to south and 36 metres east to west. At the foot of the outer stone facing, running from the eastern side around to the south-south-west, there is a flat-topped berm, a narrow ledge or shelf of ground sitting just 0.35 metres above the surrounding surface. This feature fades out toward the east but meets a more recent gateway at the south-south-west, where modern farm infrastructure has been built directly against the old stonework. Two breaks in the enclosing bank are also recorded: one at the south-east, roughly 2.7 metres wide, has been blocked up at some point, while a second at the north-east, about three metres wide with noticeably straight sides, appears to be a later, probably modern, intervention.

The site sits under working pasture, so the interior is level and grassed over, sloping gently to the south. A visitor approaching from the east will notice the berm most clearly before reaching the gateway, which marks where the historic fabric meets the practicalities of a functioning farm. The blocked entrance at the south-east is worth looking for; the infill can sometimes be read in the stonework as a slightly different texture or coursing. There are no formal visitor facilities, and access would depend on landowner permission, as is standard with monuments of this kind in private agricultural land.