A roughly rectangular enclosure, approximately 60 metres long and 12 metres wide, is defined by a low earthen bank no more than 30 centimetres high, with an external ditch running alongside it. At its south-eastern end, the bank simply stops, leaving that side open, where the enclosure merges with a small circular pond about 12 metres in diameter. The combination of precise geometry, modest scale, and deliberate incompleteness gives the whole thing a quietly puzzling quality.

The feature is classified as a designed landscape element, meaning it was almost certainly shaped for aesthetic or recreational purposes as part of the formal demesne grounds rather than for any defensive or agricultural function. Demesne landscapes of this kind, associated with country houses and their estates, were often furnished with ornamental earthworks, water features, and carefully contrived prospects. The low bank and ditch framing a pond at one end fits that tradition reasonably well, though the specific intention here remains unclear. In 2002, five archaeological trenches were excavated within the constraint area of the monument, but nothing of archaeological significance was identified, leaving the feature's precise origin and purpose unresolved.