The Sirhowy River has its source on the slopes of Cefn Pyllau-duon above Tredegar. After flowing through Siôn-Sieffre's Reservoir it turns south through Tredegar and then Blackwood and Pontllanfraith. It turns eastwards near Cwmfelinfach and joins the River Ebbw near Crosskeys.
- The confluence of the Sirhowy and the Ebbw at Crosskeys : photograph from the Crosskeys website
- www.geograph.co.uk : photo of the Sirhowy River
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