Blackwood sits on the Sirhowy river in Caerphilly, South Wales. The river rises from its source at Cefn Pyllau-duon mountain and flows through Sion-Sieffre's reservoir, Tredegar and Blackwood, before joining the Ebbw river by Crosskeys.
The Sirhowy Valley Walk makes its way past Blackwood, and weaves its way through the Sirhowy Valley along the banks of the river from its confluence with the River Ebw toward Tredegar and southern edge of the Brecon Beacons National Park.....

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