King Arthur's Round Table is a circular neolithic henge originally about 90 m in diameter, damaged by road construction, consisting of a central raised area about 24 m in diameter, from which a continuous 3.5 m wide embankment extends to the south-east.
It runs through a ditch with a width of 12 to 16 m and a depth of around 1.5 m, and over a berm seven metres wide. It then forms the 7.5 metre wide entrance through the 10 to 12 metre wide embankment. The rampart has a maximum height of 1.7 m, and at its deepest point is just over half a metre.

The monument is the centre of three henges that lie in a triangle. The henge to the south ("Little Round Table") has been destroyed. The larger Mayburgh Henge lies a few hundred metres away to the west.