Dún Dúchathair or simply Dúchathair (anglicized Doocaher),Placenames Database of Ireland meaning "black fort", is a large stone fort on the cliffs at Cill Éinne, (Killeany), Inishmore (one of the Aran Islands) in County Galway, Ireland. Due to erosion, it now sits on a rocky promontory that stretches out into the sea. On its outer side there are large walls, reaching 6 metres high and 5 metres wide. On the inside are the ruins of clocháns (beehive huts) but no water supply. There is also evidence of a cheval de frise protecting the entrance.http://www.emmedici.com/journeys/aran/eforti.htm Oileáin Árann: (Accessed July 2011)
Its age is unknown.
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