The Cashelenny stone circle complex sits on the southwestern spur of Crockarthur hill, at an elevation of roughly 180 to 210 metres, where a strip of cut bog now exposes 134 standing stones arranged in a fascinating pattern. The site was first documented by archaeologist Oliver Davies in the 1940s and 50s, but its true significance wasn’t fully appreciated until a proper survey was conducted in 1991.

The complex consists of four main features spread across more than 120 metres of exposed ground. At the southwestern end stands a stone circle approximately 10 metres in diameter, whilst five metres to the northeast sits a larger, sub-circular feature measuring about 14 metres across. What makes the second circle particularly intriguing is its interior, which contains numerous upright stones; a characteristic that sets it apart from its neighbour. Between these two circles runs a slightly irregular row of ten stones forming a line that would, if extended, run tangentially to both circles. At the northeastern extremity of the site, additional stones suggest either another short row or possibly the remains of a third circle still largely concealed by peat.

The Cashelenny complex represents what may be the westernmost example of the mid-Ulster stone circle clusters, similar to the famous Beaghmore circles in County Tyrone. These Bronze Age monuments share distinctive features: the grouping of multiple circles in one location, the use of relatively small stones, internal stone settings within some circles, and the combination of circular and linear arrangements. Most of the stones at Cashelenny barely break the surface; only nine rise more than 40 centimetres high, with the tallest being two radially set stones at the southeastern edge of the larger circle, standing 70 and 75 centimetres tall, which may have formed an entrance. The site offers expansive views southward across Lough Nageage towards Lower Lough Erne, whilst the surrounding ridges create a natural amphitheatre that would have made this a memorable gathering place for Bronze Age communities.