It encompasses sites such as the castles at Dolbadarn, Ewloe, Criccieth and Castell y Bere; as well as Penmon Priory and Basingwerk Abbey.
Mae'n cwmpasu safleoedd fel cestyll Dolbadarn, Ewlo, Cricieth a Castell y Bere; yn ogystal â Phriordy Penmon ac Abaty Dinas Basing.