River Cain

River Cain
Llanfechain Bridge over Afon Cain
Location of the mouth within Powys
Native nameAfon Cain (Welsh)
Location
CountryWales
CountiesPowys
Physical characteristics
SourceConfluence of Nant Alan and Nant Fyllon
  coordinates52°46′14″N 3°17′01″W / 52.7706°N 3.2837°W / 52.7706; -3.2837
Mouth 
  location
River Vyrnwy
  coordinates
52°46′26″N 3°08′49″W / 52.774°N 3.147°W / 52.774; -3.147
Length16 km (9.9 mi)
Basin features
Tributaries 
  leftNant Fyllon, River Abel, Nant Llys
  rightNant Alan, The Brogan

The River Cain (Afon Cain in Welsh) is a river in north Powys which flows into the River Vyrnwy.

Cain's source is just west of Llanfyllin, at the confluence of the Nant Alan and Nant Fyllon.

After flowing east through Llanfyllin, where it is joined by the small River Abel, it continues eastwards alongside the A490 highway. It then turns north-east to pass through Llanfechain and is joined by the Nant Llys before finally flowing east again. It is fed by the Brogan, before joining the Vyrnwy near Llansantffraid-ym-Mechain.

The Cain is 16 km long.