The 1897 Ordnance Survey 25-inch plan records it not as a place but as the memory of one, marked simply as "Glasha Fort (Site of)", that parenthetical word doing considerable quiet work.

What stood here was a cashel, a type of stone-walled circular enclosure used in early medieval Ireland as a farmstead or place of refuge, typically built without mortar and relying on the sheer mass of dry-stone construction for its strength. Glasha Fort was subcircular in plan, with an estimated diameter of around 30 metres. It sat, and in a faint sense still sits, in undulating pastureland among limestone pavement, the characteristic exposed grey rockscape of this part of Clare. The antiquarian Thomas Johnson Westropp, writing in 1905, placed its destruction at some point after 1878, suggesting it was dismantled within living memory of people he might have spoken to. The stone would have been useful. Walls, field boundaries, and buildings throughout the region were built from exactly this kind of material, and a cashel represented a ready-made quarry to anyone without a particular interest in preserving it.

Very little of the structure survives above ground. What remains is a very slight and intermittent scarp, the faintest raised lip in the field surface, tracing the line of what was once a substantial wall. It is the kind of feature that becomes visible only when the light is low and raking, or when viewed from above. Satellite imagery has confirmed its presence, the ghost of a circle pressed into the grass of the Clare countryside, legible to cameras if not always to the eye standing at ground level.