Cantre'r Gwaelod

Legendary sunken kingdom west of Wales

Cantre'r Gwaelod, also known as Cantref Gwaelod or , is a legendary ancient sunken kingdom said to have occupied a tract of fertile land lying between Ramsey Island and Bardsey Island in what is now Cardigan Bay to the west of Wales. It has been described as a "Welsh Atlantis" and has featured in folklore, literature, and song.

Cantre'r Gwaelod was an area of land which, according to legend, was located in an area west of present day Wales which is now under the waters of Cardigan Bay. Accounts variously suggest the tract of land extended from Bardsey Island to Cardigan or as far south as Ramsey Island. Legends of the land suggest that it may have extended 20 miles west of the present coast. There are several versions of the myth. The earliest known form of the legend is usually said to appear in the Black Book of Carmarthen, in which the land is referred to as Maes Gwyddno In this version, the land was lost to floods when a well maiden named Mererid neglected her duties and allowed the well to overflow. She further discusses a similar tale, that of the submergence of the kingdom of Helig ap Glanawg in the Conwy estuary. As with Cantre'r Gwaelod, there are tales of remains being seen of the sunken kingdom (Llys Helig). Bromwich believes that the two stories influenced each other, and that "The widespread parallels to this inundation theme would suggest that the two stories are in fact one in origin, and were localized separately in Cardiganshire and in the Conway estuary, around two traditional figures of the sixth century. She also notes that J. O Halliwell in his 1859 text An Ancient Survey of Pen Maen Mawr gives Helig the title "Lord of Cantre'r Gwaelod".

In the tale of Culhwch and Olwen, one of the Welsh Triads, one of the men at Arthur's court is named as Teithi Hen ap Gwynnan, whose land was inundated, and only he escaped. He is also mentioned in Cronica de Wallia, part of the Annales Cambriae, and the lost land is called Ynys Teithi Hen. This legend has similarities to Cantre'r Gwaelod but there is no direct connection with Seithennin. The location is placed west of Dyfed, or between Anglesey and Ireland.

The myth, like so many others, may be a folk memory of gradually rising sea levels at the end of the ice age. The physical remains of the preserved sunken forest at Borth, and of Sarn Badrig nearby, could have suggested that some great tragedy had overcome a community there long ago and so the myth may have grown from that.

The legend of Cantre'r Gwaelod is comparable to the deluge myth found in nearly every ancient culture and it has been likened to the story of Atlantis. Several similar legends exist in Celtic mythology which refer to a lost land beneath the waves. Both the Breton legend of Ker Ys and the Arthurian tale of Lyonesse refer to a kingdom submerged somewhere in the Celtic Sea, off the coast of Brittany or Cornwall respectively. A weaker parallel is the Gaelic otherworld Tír na nÓg ('Land of Youth'), often conceived of a mystical land reached via a sea voyage; however, it lacks an inundation myth.

The folk song Clychau Aberdyfi ("The Bells of Aberdovey"), popularised in the 18th century, relates to the part of the legend about the bells being heard ringing beneath the waves in the town of Aberdyfi. This song inspired cultural projects in the town involving bells; a new chime of bells was installed in September 1936 in the tower St Peter's Church, Aberdyfi, specifically designed to allow the playing of The Bells of Aberdovey. An art installation by the sculptor Marcus Vergette, a bronze "Time and Tide Bell", was mounted beneath the jetty in Aberdyfi Harbour in July 2011 as a homage to the folk song. The bell is rung by the action of water at high tide. The story of Cantre'r Gwaelod was the theme of the song entitled "Y Bobl" that competed in the final of Cân i Gymru 2021, which was written by Daniel Williams and performed by Lily Beau.

In the 1990s the village of Aberdyfi had a small primary school which changed its school badge to show a raven surrounded by bells on a shield. The raven represented the nearby Corbett Estate which owned a large amount of land and built a number of houses. The raven can be seen on various buildings in the area. The school has since been closed and demolished, making way for affordable housing.

An episode of the BBC CBeebies programme Telly Tales, first broadcast in 2009, featured a children's re enactment of the legend of Cantre'r Gwaelod through a mixture of animation and live action. Cantre'r Gwaelod featured in the BBC documentary series Coast. Presenter Neil Oliver visited the sands of Aberdyfi and Ynyslas, near Borth, and examined the remains of the submerged forest and Sarn Badrig which are revealed at low tide, assisted by local historians and dendrochronologists.