The dyke at Clawdd Mawr consists if an east facing bank and ditch, c.1.4km long, running between two stream valleys, across the watershed between the Teifi & Towy systems.

The line of the work may be carried south of Nantclawdd-uchaf, via a hedgeline or trackway.

(source Os495card; SN33SE10)

J.Wiles 27.10.03