A field wall runs along a good portion of its outer face, trees have colonised the bank, and several gaps break what remains of its circuit. The interior has been cleared and is now level ground, which means the casual eye might pass over it entirely without registering that this circular arrangement of grass and stone was once a deliberately constructed enclosure, probably dating back to the early medieval period.

The site is a rath, the Irish term for a ringfort, the most common field monument in the country. Raths were typically built between roughly the fifth and twelfth centuries as enclosed farmsteads, the surrounding bank and ditch providing a degree of security for a family and their livestock rather than forming any serious military fortification. This example at Moyglass measures around 37 metres in diameter. Its defining bank, only about half a metre high on the interior and 1.2 metres on the exterior, was once accompanied by an external fosse, a defensive ditch dug around the outside of the bank. That fosse has almost entirely disappeared now, with only slight, shallow traces remaining. The bank itself stands no more than about 1.9 metres wide. It is a modest structure by any measure, and its condition suggests that agricultural use over many centuries has gradually worn it down, incorporated it, and in places simply built over it.