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Afon Dyffryn Gwyn
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An Afon Dyffryn Gwyn (Afon Dyffryn-gwyn war gartennoù zo) zo ur stêr e Meirionnydd kozh, e kreisteiz kontelezh Gwynedd, e gwalarn Kembre.
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Eieniñ a ra e menez Trum Gelli a-us da Cwm Maethlon (anvet ivez Dyffryn Gwyn, pe Happy Valley).
Aberiñ a ra e Bae Ceredigion, e-kichen Penllyn, er c'hreisteiz da gêr vihan Tywyn.