Pistyll y Llyn, Waterfall in Ceredigion and Powys, United Kingdom
Pistyll y Llyn is a waterfall straddling the border between Ceredigion and Powys, fed by water from Llyn Penrhaeadr that pours into a steep-sided valley. The water tumbles in a series of cascades down a densely vegetated ravine before joining the River Llyfnant below.
In medieval times, this waterfall marked the boundary between the Welsh counties of Montgomeryshire and Cardiganshire. The natural water formation served as a territorial dividing line between these historic administrative regions.
The name joins Welsh words "pistyll" (waterfall) and "llyn" (lake), showing how the Welsh language shapes the geography here. Local walkers have long used this spot as a waypoint on their routes through the valley.
You can reach the waterfall by walking a permissive path from Cwm Rhaeadr down to its base. A separate trail leads upward to the top, giving you options depending on how much time and energy you have.
A weir at the water source controls the flow, meaning the spectacle changes with the seasons. You might see a roaring torrent one visit and a gentle trickle another, depending on when you arrive.
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