The monument itself is easy to underestimate: a low, circular earthwork sitting in level grassland, its outlines softened by time and weather. What survives is a central platform roughly 17 metres across on the inside, encircled by a wide fosse (a ditch, in this context dug to define and perhaps protect the central area) and an outer bank beyond that. The whole enclosure measures nearly 38 metres in diameter. Nothing about it announces itself loudly.

The form is consistent with a barrow, a type of prehistoric funerary monument found across Ireland and Britain, typically raised over burials and used as markers in the landscape for the dead. At An Cárán, the platform surface is uneven, which may hint at disturbance over the centuries, and there are faint traces of what might once have been an internal bank running from the southern to the western side. More intriguing still are the barely legible remains of a possible causeway crossing the fosse on the south-south-east, suggesting there was once a deliberate point of entry into the central space. There is also a local tradition of a spring well somewhere in the base of the fosse at the south-east, a detail that gives the site a layered character: prehistoric earthwork, possible ritual approach, and an association with water that in Irish tradition so often clusters around places considered sacred or significant.

The monument is poorly preserved, and a visitor approaching it across the grass might struggle at first to read its shape. The outer bank is low, the fosse wide but shallow, and the whole structure requires a moment of stillness and attention before its circular logic becomes apparent. The folk memory of a burial ground, passed down without formal record, is sometimes the most durable thing a monument retains.