This is a cashel, the Irish term for a ringfort built from stone rather than earth and timber, and the walls that once enclosed it have been so thoroughly incorporated into later agricultural boundaries that the structure now reads more as landscape than monument.

The site takes a subcircular form, measuring roughly 19 metres north to south and just over 23 metres east to west, dimensions that place it comfortably within the range of typical early medieval farmsteads. Ringforts, whether built from stone or raised earth, were the standard form of enclosed settlement in Ireland from roughly the sixth to the twelfth century, and many thousands survive in varying states of preservation. At Toorboney, a low remnant of the original stone wall, now standing only about half a metre high and nearly three metres thick at its base, survives along the south-southwest to west arc. Along other sections of the perimeter, field fences have been laid directly over the earlier wall foundations, making the modern boundary and the ancient enclosure almost inseparable. The site sits on a gentle north-facing slope, a common enough position for such settlements, which often favoured well-drained ground with reasonable outlook over the surrounding land.