A ringfort with no identifiable entrance is, quietly, a puzzle. Most raths, the circular enclosed homesteads that were built in their tens of thousands across early medieval Ireland, announce themselves with a clear break in their banks where a family and their cattle would have passed in and out. The one at Graignagower, in County Waterford, offers no such clue. Its perimeter has simply closed around whatever secrets it kept, leaving surveyors to note, with careful neutrality, that the entrance cannot be identified.

The fort sits on a plateau above the Curraghteskin stream, whose ravine runs north to south about 200 metres to the west. The enclosure is nearly circular, measuring 50 metres east to west and 47 metres north to south, which puts it in the middle range of rath sizes. What makes it structurally interesting is that its boundary is not uniform. Along the southern, south-eastern, and northern sides, the bank is reinforced with stone revetment, a facing of stone used to hold earthen material in place, rising between 1.2 and 1.4 metres. Around the rest of the circuit, the boundary drops to a low earthen bank, roughly 2 metres wide and only 0.6 metres high. There is no fosse, the external ditch that typically accompanies a ringfort's bank and would have added both drainage and an extra line of defence. Whether that ditch was never cut here, or has simply silted and smoothed away over the centuries, the ground gives nothing away. A second earthwork lies approximately 120 metres to the west, close enough to suggest some relationship between the two features, though what that connection was remains unresolved.