No entrance has been identified in what survives of its enclosing wall, which makes it something of a puzzle even by the modest standards of early medieval ringforts. A cashel is a ringfort defined by a stone wall rather than an earthen bank, and this one sits on elevated rough pasture at Gragan in County Clare, its circular interior measuring roughly 21.5 metres north to south and 23.5 metres east to west. What once stood as a substantial stone enclosure has been reduced, along much of its circuit, to little more than a low scarp barely visible above the ground.

The structure is part of a multiperiod field system, meaning the landscape around it preserves traces of agricultural and land-use activity from several different eras layered on top of one another. The cashel itself appears on the 1916 edition of the Ordnance Survey six-inch map, where it was recorded, and it was formally classified as an enclosure in the Record of Monuments and Places in 1996. From the west around to the east-south-east, a grassed-over bank of earth and stone survives, between 2.2 and 3.3 metres wide and rising no more than 0.8 metres on its outer face. The rest of the circuit is marked only by a scarp, in places just 0.2 metres high. A second cashel, Carricklahan, lies approximately 120 metres to the north-north-east, which raises the possibility that this part of the Burren landscape was once more densely settled than its present emptiness suggests.