Pistyll y Llyn

Pistyll y Llyn is one of the tallest waterfalls in Wales and the United Kingdom. It is a horsetail style set of falls which are located in the Cambrian Mountains about from Glaspwll in Powys, Wales. Height is a matter of contention in Wales, with many sources claiming that Pistyll Rhaeadr is the tallest waterfall in Wales or the tallest single-drop waterfall in the UK, despite being significantly surpassed in height by Pistyll y Llyn, Devil's Appendix and the waterfall at Nant Maesglase. The flow over the falls is regulated by a weir at the source of the river by the lake, resulting in low flow for most of the year. In the past, the waterfall was known as a popular destination for pilgrims.