The River Geirionydd is a river

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 in Snowdonia

Snowdonia

Snowdonia is a region in north Wales and a national park of in area. It was the first to be designated of the three National Parks in Wales, in 1951.-Name and extent:...

, North Wales

North Wales

North Wales is the northernmost unofficial region of Wales. It is bordered to the south by the counties of Ceredigion and Powys in Mid Wales and to the east by the counties of Shropshire in the West Midlands and Cheshire in North West England...

. It is a tributary

Tributary

A tributary or affluent is a stream or river that flows into a main stem river or a lake. A tributary does not flow directly into a sea or ocean...

 of the River Crafnant

River Crafnant

The River Crafnant is a tributary of the River Conwy , which is the main river of the Conwy valley in North Wales....

 (Afon Crafnant), which flows over the Fairy Falls

Fairy Falls, Trefriw

The Fairy Falls is a waterfall in the village of Trefriw, north Wales.The falls are on the river Crafnant which has its source at Llyn Crafnant, being joined upstream by a tributary, the river Geirionydd...

 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...

 in Trefriw

Trefriw

Trefriw is a village in Conwy County Borough, Wales. It lies on the river Conwy in North Wales, a few miles south of the site of the Roman fort of Canovium, sited at Caerhun. The parish population in 2001 was 924....

, and thence on into the River Conwy

River Conwy

The River Conwy is a river in north Wales. From its source to its discharge in Conwy Bay it is a little over long. "Conwy" is sometimes Anglicized as "Conway."...

 (Afon Conwy), which is the main river of the Conwy valley.

It flows from Llyn Geirionydd

Llyn Geirionydd

Llyn Geirionydd lies in a valley in North Wales where the northern edge of the Gwydyr Forest meets the lower slopes of the Carneddau mountains. The lake is almost a mile long and covers an area of , but is never any deeper than according to Jehu’s survey ...

 down a steep gorge before joining the river Crafnant. It is less than a mile in length.

The river passes the former Klondyke Mill, which used its waters. Klondyke was a mining

Mining in Wales

Mining in Wales provided a significant source of income to the economy of Wales throughout the nineteenth century and early twentieth century....

 and milling complex connected with some of the metal mines

Metal mining in Wales

Metal mining in Wales affected large areas of what are now very rural parts of Wales and left behind a legacy of contaminated waste heaps and a very few ruined buildings.There are a number of areas that have been mined for a variety of metals....

 of the Gwydir Forest

Gwydir Forest

Gwydir Forest, also spelled Gwydyr, is located in Conwy county borough and the Snowdonia National Park in North Wales. It takes its name from the ancient Gwydir Estate, established by the John Wynn family of Gwydir Castle, which owned this area....

 by means of an old tramway which ran alongside Llyn Geirionydd. From above the Mill wagons used to enter the building via an aerial ropeway.