The possible site of an Iron Age or Early Medieval promontory fort, although the features here have been interpreted as being of geological origin. 


The site is found on a projection of the brooghs and appears to be defined by a ditch measuring 7 metres wide and 1 metre in depth which cuts off the narrow neck of the promontory to the southwest. This creates an isolated shelf or "island" of flat ground which is taken to represent the interior of a fort.  Fragments of a possible outer bank have been noted outside the ditch.  It has been suggested that the "ditch" has been caused by a natural geological slip caused by coastal erosion. However, this part of the coastline appears to have remained stable since the time of the 1870 1:10560 scale Ordnance Survey map, which shows the promontory fort and names it as Cashtal Ree Gorree.


The old name of the local estate, Balyhamig, was recorded in 1515, and has been traced by antiquarians to the Scandanavian name Hamnarvik i.e. Harbour creek.  This has led to the conjection that this is might be a defensive work of late date with Viking or post-Viking association but there is no other evidence to support this.