This rectangular grass-covered enclosure, measuring 35 metres from northwest to southeast and 33 metres from northeast to southwest, is defined by substantial earthen banks that rise between 0.8 and 1.2 metres on the exterior. The banks themselves vary in width from 2.5 to 4.7 metres and create a distinctive defensive perimeter around all sides except the northwest.

What makes this site particularly intriguing is its sophisticated system of moats and defensive features. The inner banks are separated from interrupted sections of outer banks by flat-bottomed moats, which range from 3 to 6.6 metres wide at the top and narrow to 2 to 2.5 metres at the base, with depths reaching just over a metre. These outer banks, measuring 3.2 to 5 metres in width, add an extra layer of fortification to the structure. Archaeological surveys have also revealed traces of what appears to be a second outer moat or quarry on the northeastern side, though this feature is much shallower at only 0.3 metres deep.

The entrance to this ancient enclosure is positioned at the centre of the northeast side, where gaps in both the inner and outer banks create passages of 3.2 and 4.6 metres respectively. Interestingly, there’s no evidence of a causeway across the moats at this point, suggesting that access may have been controlled by a removable bridge or similar structure. The entire complex spans maximum external dimensions of 51 metres from northwest to southeast and 49 metres from northeast to southwest, representing a substantial investment of labour and planning by its creators.