A ringfort, or rath, is a roughly circular earthwork enclosure, typically of early medieval date, built as a defended farmstead. Here, the southern and western sections of the enclosing bank have been swallowed by modern field boundaries, leaving only a partial arc where once a complete circuit stood. What remains, though, is substantial enough: at the north-east the earthen bank rises 2.8 metres on its outer face and the enclosure interior measures around 27 metres north to south and just under 24 metres east to west. A band of darker grass running outside the surviving bank, roughly 2.3 metres wide, suggests the ghost of an infilled fosse, the external ditch that would originally have reinforced the enclosure's defensive character.

The site sits on a natural rise just north of the lower slopes of Knockbrack mountain, a short distance south of the Finglas river, a position that would have offered both drainage and outlook. Its Irish name, recorded in the Ordnance Survey Name Books as Lisspaderrickeecusaune, renders roughly as Lios Phádraig Uí Chiosáin, meaning the ringfort of Patrick O'Kissane, or a member of the Ó Ciosáin family. That personal name, preserved in the placename long after any physical memory of the occupant had faded, is a reminder that these enclosures were not anonymous communal structures but identified with specific individuals and families. The entrance gap, 2.7 metres wide, opens to the east, a common orientation in Irish ringforts. Inside, old cultivation ridges cover much of the floor, and near the eastern entrance a grass-covered stony mound may represent material cleared from surrounding fields in more recent centuries rather than any original feature of the fort itself.