Measuring roughly 15.7 metres north to south and 12.7 metres east to west, it is defined by a stony bank about two metres wide, its interior surface flat-topped and rising only slightly above ground level. The fact that it sits inside another enclosure is what makes it quietly curious; enclosures within enclosures are not unknown in the Irish landscape, but they tend to suggest layered use over time, one community or purpose folding itself into the footprint of another.

Enclosures of this kind are a recurring feature of early Irish settlement and land use. A stony bank enclosure, at its simplest, is a boundary defined by gathered or placed stone rather than earthen material, and such features can date anywhere from the prehistoric period through to the early medieval centuries. The flat-topped interior here is a minor but telling detail, suggesting deliberate levelling at some point rather than simple field clearance. Without excavation it is difficult to say more with confidence about function or date, and the available record for Lisnarawer offers measurements and location but does not venture into interpretation. What remains visible is a small, self-contained oval form, sitting quietly within a larger boundary, on the Sligo landscape.