As the legend goes, the Devil was actually planning to use his load of stones to fill in the valley on the other side of the Stiperstones, which is known as Hell's Gutter.

Unfortunately for him, as he got up after his rest on the highest rock of the Stiperstones, his apron strings snapped and the rocks tumbled out.

Instead of picking them up, the Devil left the rocks scattered all over the ridge - the mucky pup - and the legend has it that you can smell the brimstone on them in hot weather.

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