Pwll y wrach

Pwll y wrach (or Pwll-y-Wrach) signifies pool of the witch in Welsh. It 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 and formerly known as the Psammosteus Limestone) into a pool scoured in the softer mudstones of the underlying Ra
Found on http://en.wikipedia.org/wiki/Pwll_y_wrach
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