Pwll y wrach

Pwll y wrach or Pwll-y-wrach (Welsh for `pool of the witch`) is a feature on the River Ennig near Talgarth in south Powys, Wales. The river plunges in two separate streams over a lip of hard rock (the Bishops Frome Limestone, formerly known as the Psammosteus Limestone) into a pool scoured in the softer mudstones of the underlying Raglan Mudston.....
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