The drystone walls are up to four metres thick in some parts and there is a complete chamber intact off the entrance passage.
The main habitat is rough heath-grassland, with scrub, drystone walls and 600-700 million year old rock outcrops.
The construction of brochs, with their double-skinned drystone walls made it possible to build tall yet comparatively lightweight structures.
The surviving drystone walls rise to about three metres (10 ft) and are more than four metres (13 ft) thick in some places.
It does not include drystone walls or other important threatened rural features such as ponds.
Indeed, much of our currently accessible open land is covered in drystone walls and can be regarded as enclosed land.
We must accept that, as with the maintenance of drystone walls, that is a labour-intensive, costly and negative income exercise.
It is in a small wood and surrounded by a circular drystone wall.