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Mi wnaeth Duncan, Twm a Bruce waith dan gontract yn ddiweddar iawn i benderfynnu termau ar gyfer nifer fawr o gynefinoedd a rhestrir yn y Dosbarthiad Llystyfiant Cenedlaethol (NVC): bog – mignen marsh – cors swamp – siglen Ann _____ From: Discussion of Welsh language technical terminology and vocabulary [mailto:[log in to unmask]] On Behalf Of Siân Roberts Sent: 17 June 2010 17:52 To: [log in to unmask] Subject: bog / marsh Dyma fi eto. A oes gwahaniaeth pendant rhwng y ddau air hyn yn y Gymraeg? Mae'r dewisiadau a gynigir yn debyg iawn yn y geiriaduron. A bog is a wetland type that accumulates acidic peat, a deposit of dead plant material. A marsh is a type of wetland, featuring grasses, rushes, reeds, typhas, sedges, cat tails, and other herbaceous plants (possibly with low-growing woody plants) in a context of shallow water. A marsh is different from a swamp, which has a greater proportion of open water surface, which is generally deeper than a marsh A bog can be referred to as a swamp while a marsh technically can not. Also the acidic waters of a bog distinguish it as being different than a marsh. Diolch Siân