Tomregan is a civil parish in the ancient barony of Tullyhaw. The parish straddles the border between the Republic of Ireland and Northern Ireland. The largest population centre in the parish is Ballyconnell, County Cavan. The total area of the civil parish is 10,600 statute acres. Most of Tomregan's constituent townlands are situated in County Cavan while the remainder lie in County Fermanagh. In the Catholic Church, the ecclesiastical parish of Tomregan was split in the early 18th century, with the County Fermanagh townlands being assigned to the parish of Knockninny while the County Cavan townlands were united with the parish of Kildallan.

Ballyconnell is a town in County Cavan, Ireland. It is situated on the N87 national secondary road at the junction of four townlands: Annagh, Cullyleenan, Doon (Tomregan) and Derryginny in the parish of Tomregan, Barony of Tullyhaw.