Dalraida: now "the Route," a territory north of Slieve Mish, in the north of the County Antrim
Darè: chieftain of the cantred of Cualnge and owner of the Brown Bull of Cualnge
Dechtire: sister of King Conchobar and mother of Cuchulain
Delga: see Dun Delga
Delga Murthemni: Dundalk
Delinn: a place or river near Kells between Duelt and Selaig, on Medb's march from Cruachan into Ulster
Delt: a place north of Drong, on Medb's march from Cruachan into Ulster
Delt: a river in Conalle Murthemni
Dergderc: Lough Derg, an expansion of the Shannon near Killaloe