This is a cashel, the term used for a ringfort built from stone rather than earthen banks and ditches, and it measures just under 23 metres north to south and a little over 24 metres east to west. Ringforts of this kind were typically farmstead enclosures, built throughout early medieval Ireland between roughly the fifth and twelfth centuries, and thousands survive across the country in varying states of preservation. What makes this one worth attention is the legibility of its construction even in ruin.

The most intact stretches of the original outer facing survive to the south-west and west, where large, regular blocks are still visible with a core of smaller stones packed between them, a characteristic dry-stone construction technique that could hold a wall upright without mortar. The inner facing has fared less well, reduced in places to foundation level, though some rebuilding has been carried out along its general line. The eastern entrance, originally 2 metres wide, has been blocked by a later wall. Inside the enclosure, cultivation ridges run across the interior on a north-south axis, suggesting the space was put to agricultural use at some point after the cashel's original function had lapsed. These lazy beds, as such ridges are commonly known, are a familiar sight in the Irish landscape and are often associated with intensive potato cultivation in the post-medieval period, though they can date from other eras too. The overlap of early medieval enclosure and later tillage marks in a single small field makes Shronagreehy a quietly layered place, where different centuries of land use have been pressed together into the same patch of ground.