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Rhys Jones
b'
Beti George yn sgwrsio gyda\'r Athro Rhys Jones o Adran Ddaearyddiaeth Prifysgol Aberystwyth.
Cawn wybod am y "Plynlumon Man", yr ymchwil gan y Brifysgol i mewn i borthladdoedd Cymru, a hefyd, beth yn union yw\'r Fro Gymraeg?
'