Ystrad Mynach is a town in the County Borough of Caerphilly, previously within the ancient traditional county of Glamorgan, Wales, and is 5 miles north of Caerphilly town. It has a population of around 13,500 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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