Dubh Sithleann (or Sainglenn): the name of one of Cuchulain's two horses
Dubloch: a lake between Kilcooley and Slieve Bawne, in the County Roscommon, on Medb's march from Cruachan into Ulster
Dubthach Doel Ulad: the Ulster noble who shares with Bricriu the place as prime mover of evil among the Ulstermen (pronounced Dŭf-fach)
Duelt: north or north-west of Delt, on Medb's march from Cruachan into Ulster
Dun da Benn: Mount Sandle, on the Bann, near Coleraine in the County Derry
Dun Delga: Dundalk, or the moat of Castletown, on the east coast near Dundalk; Cuchulain's home town
Dun macNechtain Scenè: a fort in Mag Breg, at the place where the Mattock falls into the Boyne, about three miles above Drogheda
Dun Sobairche: Dunseverick, about three miles from the Giants' Causeway, in the County Antrim
Elg: an old name for Ireland
Ellne: probably east of the River Bann, near Coleraine