Diocese of Kilmore, Elphin and Ardagh Diocese of Kilmore, Elphin and Ardagh The United Dioceses of Kilmore, Elphin and Ardagh is a diocese of the Church of Ireland located in central Ireland. It is in the ecclesiastical province of Armagh. It is one of twelve Anglican dioceses in the island of Ireland. The geographical remit covers all of County Leitrim, almost all of counties Cavan, Longford and Roscommon, plus smaller parts of counties Westmeath, Sligo, Donegal and Fermanagh. There had been two other cathedrals, but are now in ruins. The historic sees of Kilmore and Ardagh were intermittently united in the 17th and 18th centuries until
County Cavan springs near Bailieborough; the River Annalee which flows from Lough Sillan and joins the Erne; and the Cladagh river which rises from Cuilcagh and flows into Fermanagh. The Glyde and the Owenroe also source in Cavan. Cavan is known as 'The Lakeland County' and is reputed to contain 365 lakes. At , Lough Sheelin is the county's largest lake; it is situated in the south of the county and forms a three way border on its waters between counties Meath, Westmeath and Cavan. A large complex of lakes form in the north and west of Cavan into designated Specially Protected