A natural knoll on the north side of the Usk Valley has been scarped, ditched and counterscarped to form a sub-oval enclosure measuring about 92m north-east by south-west by 65m. The interior has been much quarried.
Sources:
OS record card ST39SE13.
RCAHMW air photos: 94-CS-0577; 945077/63-4; 965075/68.
