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Ystumtuen
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Ur gêriadenn eus Kembre eo Ystumtuen e hanternoz Kontelezh Ceredigion, un trizek kilometr er reter da Aberystwyth, en torgennoù etre Ponterwyd ha Pontarfynach.
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Gant Ponterwyd ez a d'ober kumuniezh Blaenrheidol.
Dont a rafe anv ar gêriadenn eus ur pleg (ystum) en Afon Tuen. Ruilhal a ra an nant-se da vetek an Afon Rheidol, un 800 m bennak e kreisteiz ar gêriadenn. Hervez ar yezhour R. J. Thomas e talvez tuen kement ha "nant yn rhedeg hyd lechwedd serth" (diwar ar wrizienn tu- "ochr", cf. 'tuedd')[1].