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About Ystrad Mynach

Ystrad Mynach is a town in the Caerphilly County Borough, within the ancient county of Glamorgan, Wales, and is north of the town of Caerphilly. The urban area has a population of 19,204, and stands in the Rhymney Valley. Before the Industrial Revolution and the coming of coal mining in the South Wales Coalfield the valley was rural and farmed. It lies in the community of Gelligaer.

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