The hill itself rises dramatically from the rocky shoreline of Lough Swilly to the west, providing commanding views across the water. These modest stone arrangements, positioned in the saddle between the hill’s two summits, offer a glimpse into the prehistoric landscape of this corner of Ireland.

The circles were first documented in detail by Boyle-Somerville in 1909, who recorded six small stone circles just outside the cashel wall. He described them as “perfect or nearly so,” though constructed from relatively small, untrimmed stones and sitting low to the ground. Each circle measures approximately three metres in diameter; a modest scale that suggests they may have served a different purpose than the grander stone circles found elsewhere in Ireland. By 1983, when archaeologist Lacy surveyed the site, only four circles were noted as clearly visible, highlighting how these ancient monuments gradually blend back into the landscape over time.

The exact purpose of these circles remains unknown, though their proximity to the cashel suggests they may have been connected to the activities that took place within that fortified enclosure. Whether they served as ritual spaces, markers, or had some practical function related to the cashel’s inhabitants, they add another layer of intrigue to this windswept hilltop site. The combination of the stone fort and these enigmatic circles creates a complex archaeological landscape that speaks to centuries, if not millennia, of human activity on Crockacashel Hill.