The river Neath normally flows beneath ground at this point and the river bed is normally dry, but after the heavy rain the river is flowing both above and below ground.

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The dried up gorge created millions of years ago by the river Neath before it took its underground route

Tags:   ystradfellte Neath Valley river waterfalls caves South Wales Ben Salter

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One of many cave entrances to be explored in this area.

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The river plunges into the depths. Above and beyond the pit, an onlooker stands on the original river bed.

Tags:   ystradfellte Neath Valley river waterfalls caves South Wales Ben Salter

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Downstream of the caves, the Neath makes this dramatic drop.

Tags:   ystradfellte Neath Valley river waterfalls caves South Wales Ben Salter

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