To its south, the ground falls away in a sheer drop; to its south-west, a ravine cuts through the hillside. It sits on a steep east-facing slope where the interior tilts downward beneath a thick cover of trees and overgrowth, making its boundaries easier to read on a map than on the ground.

The enclosure is sub-rectangular in plan, measuring roughly 80 metres north to south and 45 metres east to west. It is defined by a low earthen bank, about 7.2 metres wide, which stands only 0.35 metres above the interior but rises to 0.8 metres on the exterior face, and by an earthen scarp, a natural or deliberately shaped slope used as a boundary feature, running south-south-westward and measuring 4.5 metres wide and 2.4 metres high. The bank is most clearly formed along its western, northern, and north-eastern stretches, and at its northern end it turns inward toward a separate adjoining enclosure, leaving a gap of roughly 10 metres between the two. This relationship with neighbouring earthworks is what gives the site particular interest. Immediately to the west lies a cliff-edge fort, a type of enclosure that uses a natural precipice as part of its defensive boundary, and the enclosure's bank actually extends from the south-west corner of that fort. A further enclosure sits about 70 metres to the east. Rather than standing alone, this earthwork appears to be one component in a loose cluster of related monuments, all making deliberate use of the dramatic topography of the Grove Wood slope.