Rather than forming a complete ring, it is D-shaped, roughly 38 metres across at its widest point, with one notably straight side running for approximately 43 metres along the north-northwest. The whole thing is defined by grassed-over wall foundations, low enough now that they read more as a subtle thickening of the ground than anything resembling standing masonry.

The site sits on a south-facing slope in an area of karst, the distinctive limestone terrain common across much of County Clare, where rock breaks through thin soil and drainage vanishes underground. What makes Lisgoogan quietly interesting is that this enclosure does not exist in isolation. It lies within an extensive multiperiod field system, meaning the landscape around it carries the layered traces of human activity from several different eras, boundaries and divisions accumulating over centuries. A second enclosure sits roughly 100 metres to the northeast, suggesting this part of the hillside was once organised and inhabited in ways that are still only partially legible from the surface. The D-shaped plan, with its straight side, is a form that sometimes points to early medieval origin in Ireland, though the notes here do not fix a date, and the site should be read as one element within a broader, still-unresolved pattern of land use rather than a standalone monument.