Afon Rhythallt

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The River Rhythallt (Afon Rhythallt) is a river in North Wales whose source is on the northern shore of Llyn Padarn and which then runs past the village of Brynrefail, Gwynedd. After the river has flowed beneath Pont Rhythallt in Llanrug it changes its name to Afon Seiont and eventually reaches the sea at Caernarfon. The river has a broad flood plain which occasionally threatens homes in the village of Cwm-y-Glo.