Pistyll y Llyn is one of the tallest waterfall

Waterfall

A waterfall is a place where flowing water rapidly drops in elevation as it flows over a steep region or a cliff.-Formation:Waterfalls are commonly formed when a river is young. At these times the channel is often narrow and deep. When the river courses over resistant bedrock, erosion happens...

s in Wales and the United Kingdom. It is a horsetail style set of falls which are located in the Cambrian Mountains

Cambrian Mountains

The Cambrian Mountains are a series of mountain ranges in Wales, reaching from, and including, the South Wales mountains of the Brecon Beacons, north Carmarthenshire and Ceredigion, the Black Mountains of eastern Wales, to Snowdonia in North Wales...

 about 4 km from Glaspwll in Powys

Powys

Powys is a local-government county and preserved county in Wales.-Geography:Powys covers the historic counties of Montgomeryshire and Radnorshire, most of Brecknockshire , and a small part of Denbighshire — an area of 5,179 km², making it the largest county in Wales by land area.It is...

, Wales

Wales

Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...

.

It is formed where the River Llyfnant

River Llyfnant

The River Llyfnant, , near Eglwys Fach in Ceredigion, Wales is a tributary of the Dyfi estuary. The river reaches the hill walk of Uwch Garreg, then plunges over the waterfalls known as Pistyll y Llyn, into the ravine that opens to the Dyfi estuary. Red Kite are noted for circling the area...

 falls from Llyn Penrhaeadr for approximately 160 metres into Cwm Rhaeadr in two waterfalls, and a series of cascades. The tallest waterfall is a single horsetail drop of 91 metres. This is sometimes mistakenly stated as 73 metres.