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The Rhymney River

​The River Rhymney rises on the southern edge of the Brecon Beacons before descending steeply through the town of New Tredegar towards Ystrad Mynach and then onwards across a flat plain before entering the Severn Estuary to the east of Cardiff.​

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​It covers a distance of 30 miles. The catchment can be divided into two main parts: a steep-sided, wet, mountainous upper valley, and a flatter wider valley below Machen, where the river assumes a lowland meandering character.​

While the river used to flow black with coal dust during the mining era, substantial improvements over the last 40 years have followed pit closures. The Rhymney now supports a healthy stock of grayling and natural brown trout.​

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