The Afon Marlais is a right-bank tributary of the Afon Cothi in Carmarthenshire, West Wales. It rises on the slopes of Mynydd Llanfihangel-rhos-y-corn and Mynydd Tre-beddau and flows south-eastwards through Brechfa Forest before reaching the village of Brechfa. After a further kilometre it joins the Cothi immediately downstream of Pont Ynys-Brechfa.[1]
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