It is an unusual shape for an enclosure of this kind: roughly 106 metres east to west and 82 metres north to south, its defining bank and external fosse, a fosse being a defensive ditch dug alongside an earthen bank, curve in a smooth arc from the south-west around through the north and back to the south-east, while a straight scarp closes off the remaining side. The result is a lopsided geometry that follows the lie of the land rather than any tidy geometric ideal.

The enclosure's interior is not simply an open space. A series of low earthen banks subdivide it internally, suggesting that whatever activity once took place here was organised into distinct areas or zones, though exactly what that activity was remains unclear. A causewayed entrance gap, just over three and a half metres wide, opens at the east-south-east, the causeway being an uncut section of ground left across the fosse to allow passage in and out. The site is noted in sources going back to Redington in 1912 and Westropp in 1919, both of whom recorded it as part of a broader landscape still marked by old trackways and field boundaries. An old trackway runs immediately to its south, and a road passes just to the north, meaning this earthwork has sat between two routes for a very long time, observed but rarely examined closely.