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 (Bishop's Frome Limestone, formerly known as Psammosteus Limestone) into a pool scoured in the softer mudstones of the underlying Raglan Mudstone formation. The feature occurs within Cwm Pwll-y-wrach, a deep wooded valley that is a Site of Special Scientific Interest and a nature reserve managed by the Brecknock Wildlife Trust.