Cropmark or parchmark, of a subrectangular ditched enclosure, about 35-40m across with rounded corners, visible on RAF vertical cover (106G/UK/1470:4418).
Situated about 500m north-west of Llanio Roman fort (NPRN 92319), the enclosure lies in badly drained area of marginal land & may represent a minor Roman military work.

J.Wiles 29.10.03