What makes it quietly puzzling is not just its shape but the evidence of water management built into its very structure. A leat, which is an artificial channel cut to direct flowing water, once breached the enclosure's bank at the north-east, ran along the inner edge of the bank at the north and west, and exited again at the south-west. The leat is dry now, but its course is still readable in the landscape.

The enclosure itself is about 20 metres in diameter, defined by an earthen bank between two and four metres wide and standing up to two metres high, with internal stone cladding facing the interior. It was already recorded on the Ordnance Survey's six-inch map of 1839, which means it was a visible and notable feature even then, sitting squarely in the stream valley on the county boundary. The combination of a water-management channel integrated so deliberately with the bank suggests this was not a straightforwardly defensive or ceremonial site. The positioning of the leat along the inner edge of the bank points towards some kind of controlled use of water within the enclosed space, though whether that served a mill, a fishery, or some other purpose remains an open question. The stone cladding on the interior face of the bank adds another layer of care in the original construction that is not typical of simple field enclosures.