On the flat coastal plain beside Tralee Bay, roughly 275 metres from the shore, a ringfort once stood that has been so thoroughly levelled that only a faint raised area in the ground now betrays its presence. Ringforts, the enclosed farmsteads of early medieval Ireland typically defined by one or more earthen banks and ditches, were once among the most common features of the Irish landscape; many thousands survive in varying states of preservation. This one, at Lisnagree, is not among them.

When the Co. Kerry Field Club visited the site in 1946, the situation was already poor: the enclosing bank had all but vanished, though the outline of the enclosure could still be traced. Even at that stage, something of structural interest survived inside it. At the centre stood an oblong stone foundation measuring roughly 10.6 metres by 6 metres, and in the western sector there was a blocked-up entrance to a souterrain, an underground stone-lined passage of the kind frequently found beneath or beside ringforts, used variously for storage, shelter, or refuge. The souterrain entrance was sealed even then, its interior inaccessible. Sometime in the decade or so before the site was recorded in J. Cuppage's 1986 archaeological survey of the Dingle Peninsula, the remaining earthworks were levelled entirely, removing what the field club had described and leaving only that barely perceptible rise in the ground.