Afon Prysor

General data

Name: Afon Prysor
Water system: River Dwyryd
Water type: River
Progression: River Dwyryd -> Tremadog Bay -> Cardigan Bay -> Irish Sea -> Atlantic Ocean -> Planet Earth
Climates: Temperate
Continents: Europe
Countries: Wales (UK)

The Afon Prysor is the largest tributary of the Dwyryd, entering its left bank in the tidal section downstream of Maentwrog. It rises in the hills to the east of Trawsfynydd and flows past the southern end of the village to enter Llyn Trawsfynydd, a large reservoir close to the A470. Prior to construction of the dam in the 1920s for hydroelectric power, the river had wandered across a broad upland marsh here known as Cors Goch. It is the only inland water in the UK that has been used as a source of cooling water for a nuclear power station. The Afon Prysor resumes its course below the dam, to flow down to the Dwyryd through the steeply wooded valley of Ceunant Llennyrch which is at the core of a national nature reserve. Most of the flow from the reservoir is channelled through the hydro-electric power station close to Maentwrog; the flow then re-joins the Prysor just before the confluence.

Afon Prysor

General data

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