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In ancient Greece the lost city of Atlantis captured imaginations, yet Wales has its own tale of a lost land swallowed up by the sea. Cardigan bay is the backdrop for the story of Cantre'r Gwaelod.

It might not look like it today, but the Bristol Channel was once an expansive, forested land, with semi-fossilised ancient tree stumps occasionally exposed at the lowest tides. The earliest settlers inhabited lands drowned by the melting of ice-age glaciers millennia ago.

But there’s evidence to suggest that and existed beyond Mumbles Head in South Wales as recently as four centuries ago. Medieval accounts tell of a bridle path from Penrice Castle to Margam Abbey that led travellers far past the headland of Mumbles, Wales Online reports.

It’s thought that Grove Island, or G

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