The structure occupies a level patch of ground overlooking the waters of Lough Croangan and Lough Crumbane, with the cliff face itself forming the straight edge of the D shape. The remaining curve is marked out by eleven stones of various sizes, with the most substantial ones positioned at the southeastern end.

Measuring roughly 9.4 metres from northwest to southeast and 5.6 metres across, this enigmatic feature offers few clues about its original purpose. Unlike many ancient stone structures found throughout Ireland, there’s no obvious entrance or doorway, which makes determining its function particularly challenging. The stones appear deliberately placed rather than naturally occurring, yet they lack the typical characteristics that would clearly identify the site as a burial monument, dwelling, or ceremonial space.

Archaeological surveyor Patrick F. O’Donovan documented this anomalous stone group in June 2012, noting that the surviving remains simply don’t provide enough evidence to determine what the structure was used for with any certainty. Whether it served as a boundary marker, had ritual significance, or fulfilled some practical purpose for the people who constructed it remains a mystery; one of many such archaeological puzzles scattered across Donegal’s rugged landscape.