What survives today is easy to misread: a curved bank, a slight hollow at the centre, the kind of topographical quirk that most walkers would pass without a second thought. But the geometry is deliberate, and it has been quietly accumulating meaning for centuries.

The Ordnance Survey's six-inch map of 1834 records a circular embanked enclosure here, roughly fifty metres in external diameter, labelled in the gothic script that the surveyors reserved for antiquities, simply as a fort. By the time the 1907 edition was produced, the monument had softened further into the landscape, described then only as a curved field bank around a slight rise. A ringfort, to give it its more familiar name, is a type of enclosed farmstead typical of early medieval Ireland, usually consisting of an earthen bank and ditch encircling a domestic space. At Cremartin, the perimeter bank appears to have been absorbed into later field boundaries running roughly south-west to north-east, reducing the visible diameter to around twenty-nine metres. At the centre, a slightly sunken circular area between six and seven metres across, defined by a small bank, suggests the ghost of a hut-site, the floor of a structure long since gone. A small canalised stream runs approximately forty metres to the east, the kind of controlled watercourse that often appears near settlements where drainage or water access mattered.

What gives the site a particular texture is that it never entirely dropped out of local memory. Folklore collected through the Irish Schools' Manuscripts scheme, in which schoolchildren recorded local knowledge and tradition during the 1930s, names this rise as a fort in two separate manuscript volumes. The label stuck not because anyone kept digging or debating it, but because the place had a presence that local knowledge chose to preserve, even as the earthworks themselves gradually merged with the working landscape around them.