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In page Malvern Hills:

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There is a tiny, man-made cave near the ridge of the hills called Clutter's Cave (or Giant's Cave or Hermit's Cave or Waum's Cave, after Walm's Well which is located on the boundary of News Wood below).[5][6] The cave has been excavated into pillow lavas. Some of the rounded 'pillow' shapes are still visible around the entrance to the cave.[7]