Why it belongs here
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 (Bishop's Frome Limestone, formerly known as Psammosteus Limestone) into a pool scoured in the softer mudstones of the underlying Raglan Mudstone formation.
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