[1] The territory of Aidhne is bounded on the west by Loch Lurgan (Galway Bay) and the barony of Burren in County Clare in the province of Munster.
On the north-east Aidhne is bounded by the plains of Uí Mhaine and on the north by Mag Mucruime (modern Má Mucraimhe, the area around Athenry).
Dubhaltach Mac Fhirbhisigh's Book of Genealogies states that the Tuath mhac nUmhóir[settled in]in Dál gCais and in Uí Fhiachrach of Aidhne.
The territory of Uí Fhiachrach Aidhni is coextensive with the diocese of Cill Mhic Dhuach / Kilmacduagh, which contains the civil parishes of Kinvarradoorus, Killinny, Killeenavarra, Drumacoo, Kilcolgan, Ardrahan, Stradbally, Killeeneen, Killeely, Killora, Killogilleen, Kilchreest, Isertkelly, Killinan, Kilthomas, Kilbeacanty, Beagh, Kilmacduagh, and Kiltartan.
The diocese of Kilmacduagh contains the present Catholic parishes of Kinvara, Ballinderreen, Gort, Ardrahan, Craughwell, Beagh, Kilbeacanty, Kilthomas (Peterswell), Clarinbridge, and Kilchreest.