The Ancient Irish Epic Tale Táin Bó Cúalnge

Ath Lethain: a ford on the Nith, in Conalle Murthemni

Ath Luain: Athlone, on the Shannon, on the borders of Connacht and Meath

Ath Meislir: a ford in Sliab Fuait, in Ulster

Ath Moga: the present Ballymoe, on the river Suck, about ten miles to the south-west of Cruachan, County Galway

Ath Mor: the old name for Ath Luain

Ath na Foraire: on the road between Emain and Loch Echtrann

Ath Slissen: Bellaslishen Bridge; a ford on the Owenure River, near Elphin, in Connacht

Ath Solomshet: a ford, probably in Ulster

Ath Srethe: a ford in Conalle Murthemni

Ath Tamuin: a ford, somewhere in Ulster

Ath Traged: at the extremity of Tir Mor, in Murthemne

Ath Truim: Trim, on the river Boyne, in the County Meath

Aue: a slave in the household of King Conchobar

Aurthuile: north-east of Airne

Bacca: in Corcumruad

Bacc Draigin: a place in Ulster

Badb: the war-fury, or goddess of war and carnage; she was wont to appear in the form of a carrion-crow. Sometimes she is the sister of the Morrigan, and, as in the Táin Bó Cúalnge, is even identified with her (pronounced Bive)

Badbgna: now Slieve Bawne, a mountainous range, in the barony of Ballintubber, in the east of County Roscommon

Baile: north-east of Meide ind Eoin, on Medb's march from Connacht into Ulster

Baile in Bile: on the way to Ardee

Bairche: Benna Bairche, the Mourne Mountains, north of Dundalk, in Ulster

Ball Scena: north-east of Dall Scena

Banba: an old name for Ireland

Banna: now the Bann, a river in Ulster

Becaltach: grandfather of Cuchulain

Bedg: a river in Murthemne

Belat Aileain: probably between Cualnge and Conalle Murthemni

Belach Caille More: north of Cnogba

Benna Bairche: see Bairche

Berba: the Barrow, a river in Leinster

Bercha: on or near the Shannon, near Bellanagare, in East Roscommon

Berchna: probably for Bercha

Bernas: the pass cut by Medb from Louth into Armagh; probably the "Windy Gap" across the Carlingford Peninsula

Betha: see Sliab Betha

Bir: the name of several rivers; probably Moyola Water, a river flowing into Lough Neagh

Bithslan: a river in Conalle Murthemni

Blai: a rich Ulster noble and hospitaller

Boann: the River Boyne

Bodb: the father of Badb

Boirenn: Burren, in the County Clare