Grey Mare's Tail, Llanrwst, Natural waterfall in Snowdonia National Park, Wales
Grey Mare's Tail is a waterfall near Llanrwst in Snowdonia formed by two distinct cascades that drop into a plunge pool below. The water flows continuously over exposed bedrock, shaped by the force of the water over many years.
The site once held a mill called Felin Blwm that first processed lead ore from the Parc Mine. It was later converted into a sawmill to cut timber from the nearby forest.
The Welsh name Rhaeadr y Parc Mawr means 'waterfall of the great park' and links the place to the water source in Gwydir Forest. This name reflects how closely the falls are connected to the surrounding woodland.
This spot can be reached by following a walking trail that starts from Llanrwst railway station and passes through the surrounding landscape. Parking run by the Forestry Commission is available near the starting point for those arriving by car.
In the 1590s, Sir John Wynn diverted water from above the falls to supply a fountain at his nearby Gwydir Castle. This fountain continues to flow today, showing an impressive engineering solution from centuries ago.
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