A rath, as this type of enclosure is commonly known in Irish, is a roughly circular earthwork defined by one or more banks and ditches, typically dating to the early medieval period between roughly 500 and 1000 AD. They served as farmsteads and defensible enclosures for families of some local standing, and tens of thousands of them once dotted the Irish countryside. Many have since been ploughed out, built over, or simply eroded into ambiguity. The fact that this one retains enough presence to be formally classified is itself worth noting.

Raths are among the most common archaeological monument types in Ireland, yet each one carries its own peculiarities of location and survival. The townland name Toornanoulagh is Irish in origin, as nearly all Kerry place names are, and in a county where the density of early medieval settlement remains visible across hillside and valley alike, a ringfort here fits a broader pattern of dispersed farming communities that shaped this part of Munster long before any Norman influence arrived. Without more detailed field records it is not possible to say whether this particular example survives as an earthwork or has been reduced to a cropmark, whether it stands on elevated ground commanding a view of surrounding farmland, or whether any associated features such as a souterrain, an underground stone-lined passage sometimes found inside ringforts and used for storage or refuge, have been identified nearby.

For now, Toornanoulagh's rath belongs to that category of Irish monuments that are known to exist but whose details remain to be fully documented and shared. Kerry is well supplied with accessible ringforts at sites where local knowledge and signage help orient the visitor, and any journey into this part of the county is likely to bring several such earthworks into view without much searching.