The ringfort at Killeenleigh sits on a south-west-facing slope in County Cork, its roughly circular outline still visible as an earthen bank that curves from the north-east around to the west-north-west. A ringfort, sometimes called a rath, was the standard enclosed settlement of early medieval Ireland, a raised earthen or stone-faced bank enclosing a homestead and its immediate yard, used for both habitation and the protection of animals. This one measures roughly fifty metres north to south and forty metres east to west, with an interior space of nearly thirty-nine metres across.

The earliest recorded depiction of the enclosure appears on the Ordnance Survey six-inch map of 1842, where it is marked as a hachured circular form, the standard cartographic shorthand of the period for a raised earthen feature. The surviving bank reaches a height of 1.3 metres and is faced with stone on both its inner and outer faces, a construction detail that suggests some care in the original build. That stonework has partially collapsed in places. A gap of just under three metres in the south-west portion of the bank likely marks the original entrance. On the northern side, a laneway running east to west has effectively taken over the line of the enclosure, and a straight field fence connects the north-east end of the surviving arc to that lane, absorbing the ancient boundary into the ordinary geometry of the working farmland around it.