on Moel Tryfan.

Between 85 and 90% of the population of the Nantlle Valley speak Welsh as their first language.

Some of the communities came into being as a result of slate quarrying in the late eighteenth or early nineteenth centuries, and some have a history stretching back to antiquity. There are Iron Age forts at Caer Engan in Pen-y-groes and on the coast at Dinas Dinlle

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