The Afon Twymyn ( en, River Twymyn, italic=yes) is a

river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of wate ...

Powys Powys (; ) is a Local government in Wales#Principal areas, county and Preserved counties of Wales, preserved county in Wales. It is named after the Kingdom of Powys which was a Welsh succession of states, successor state, petty kingdom and princi ...

Mid Wales Mid Wales ( cy, Canolbarth Cymru or simply ''Y Canolbarth'', meaning "the midlands") or Central Wales refers to a region of Wales, encompassing its midlands, in-between North Wales and South Wales. The Mid Wales Regional Committee of the Senedd ...

. From its source at the 40-metre high Ffrwd Fawr

waterfall A waterfall is a point in a river or stream where water flows over a vertical drop or a series of steep drops. Waterfalls also occur where meltwater drops over the edge of a tabular iceberg or ice shelf. Waterfalls can be formed in several wa ...

and head of the Pennant Valley near

Dylife Dylife is a former mining settlement in Powys, Wales, located at the head of Afon Twymyn in the Cambrian Mountains, one mile west of the road between Llanidloes and Llanbrynmair ( B4518). It is in the historic county of Montgomeryshire. The nea ...

the river flows through

Llanbrynmair Llanbrynmair () is a village, community and electoral ward in Montgomeryshire, Powys, on the A470 road between Caersws and Machynlleth. Llanbrynmair, in area, is the second largest in Powys. In 2011, it had a population of 920. Description The co ...

before joining the

River Dyfi The River Dyfi ( cy, Afon Dyfi; ), also known as the River Dovey (; ), is an approximately long river in Wales. Its large estuary forms the boundary between the counties of Gwynedd and Ceredigion, and its lower reaches have historically been c ...

upstream of

Cemmaes Road Cemmaes Road ( cy, Glantwymyn; ) is a village in Powys, Wales. It is in the community (civil parish) of Glantwymyn. The village was named in English after the now-closed station on the Newtown and Machynlleth Railway, now part of the Cambrian ...

See also