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    Manylion
    Delweddau
    Safleoedd Cysylltiedig
    Archifau Cysylltiedig
    NPRN18729
    Cyfeirnod MapSO00SW
    Cyfeirnod GridSO0446200927
    Awdurdod Unedol (Lleol)Rhondda Cynon Taff
    Hen SirGlamorgan
    CymunedMountain Ash
    Math O SafleTŶ HIR
    CyfnodÔl-Ganoloesol
    Loading Map
    Disgrifiad
    Gelli Ddu Fawr is a three-unit longhouse, described by Harry Brooksby in 1981 as being in a ruinous condition.