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worotan t1_ixi85sy wrote

Reply to comment by subtlebulk in Lost islands cited in Welsh folklore and poetry are plausible, new evidence on the evolution of the coastline of west Wales has revealed by marketrent

> They suggest that the islands could be the remnants of a low-lying landscape underlain by soft glacial deposits laid down during the last ice age. Since then, forces of erosion have worn away the land, reducing it to islands, before these too were worn away and disappearing by the sixteenth century.

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