Afon Twrch
The 883rd longest river in the world
The Afon Twrch is a river which rises in the Black Mountain in south Wales. It forms the boundary between Powys and Carmarthenshire and, downstream of Ystradowen, between Powys and Neath Port Talbot.
Flows through: United Kingdom.
River data from Wikidata (CC0); lengths normalised to a common unit.