is a Megalithic stone structure known as a "full-court tomb". It was uncovered and investigated by archaeologists between 1969 and 1973.
That excavation revealed a long cairn - about 40m - with a two chambered gallery, and a subsidiary chamber on the North Western end of the court.
The site is also sometimes referred to as Pontabane Cairn
. (I think perhaps the hump that existed here before the excavation was called "Pontabane Cairn"
and what was revealed by the excavation was named "Croaghbeg Tomb"
. But that is just a guess on my part.)
Looking down you can see the massive stones that form the sides and back of the chambers. They are each about 2m in diameter. The lintel stones at the entrance and between the chambers are each about 2.5m wide and almost a metre thick.
This is one of three Megalithic tombs in the Shalwy valley, which lies on the road from Killybegs to Slieve League
about 6km West of Killybegs and about 3km East of the village of Kilcar.
Based on its style of construction it is likely that Croaghbeg was built about 6,000 years ago - about 1,000 years before work started on Stonehenge or the great Egyptian pyramids.
is just along the coast between Shalwy and the village of Kilcar
Despite being somewhat neglected, the site is open for access by the public. It is reached from a narrow local road by climbing over a gate and crossing two small steeply sloping fields. (It is the road just West of the marker on the GoogleMap from the link below.)
In winter the fields are bare but soggy underfoot. In summer they are covered in head-high ferns which can be very wet even when the ground is dry. So visitors need clothes and shoes suited to rough, wet terain.
There are a lot of wild orchids
and other wildflower treats in the surroundings, which perhaps provide compensation for the site's untended state.