Pistyll Rhaeadr (Welsh pronunciation: [pɪstɨ̞ɬ r̥eɨ̯adr], meaning "waterfall (of) Rhaeadr"[Note 1]) is a waterfall 4 miles (6 kilometres) from the village of Llanrhaeadr-ym-Mochnant in Powys, Wales, and 16 miles (26 kilometres) west of Oswestry.

Pistyll Rhaeadr is formed by the Afon Disgynfa (disgynfa also means "waterfall") falling, in three stages, over a 240-foot (73 m)[1] Silurian cliff-face, below which the river is known as the Afon Rhaeadr.

[2] It is counted as one of the Seven Wonders of Wales and is a Site of Special Scientific Interest.

The 19th-century author George Borrow, in his book Wild Wales, remarked of the waterfall: "What shall I liken it to?

I scarcely know, unless it is to an immense skein of silk agitated and disturbed by tempestuous blasts, or to the long tail of a grey courser at furious speed.