A c.350m section of Roman road, part of RR642 (nprn 305906) Caersws - Caer Gai (nprn 92468, 95436).
The road, represented by earthworks and parchmarks noted from the air, runs northwards from SJ04320406, turning to run NNW at given National Grid Reference as far as SJ04210440.
Section to north = nprn 400037.
Source: Jones 1961 (BBCS 19.2, 177-192), 186, fig 5a.
RCAHMW AP94-CS 0058-61, 0509
RCAHMW AP945005/61
J.Wiles, RCAHMW, 06.04.2004.