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

river A river is a natural flowing watercourse, usually freshwater Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. Although the ...

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 severa ...

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 (Wales), 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. ...

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