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Tomregan is a civil parish in the ancient barony of Tullyhaw. The parish straddles the international 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.
The Fermanagh townlands in Tomregan civil parish are- Aghindisert, Carickaleese, Cloncoohy, Derrintony, Derryart, Garvary, Gortahurk, Gortaree, Gortineddan, Gortmullan, Knockadoois, Knockateggal, Tonymore and Ummera.
The Cavan townlands in Tomregan civil parish are- Agharaskilly, Aghavoher, Annagh, Aughrim, Berrymount, Carrigan, Carrowmore, Cavanagh, Clifton, Cloncollow, Corranierna, Cranaghan, Cullyleenan, Derryginny, Doon, Tomregan, Fartrin, Gortawee or Scotchtown, Gortoorlan, Moher, Mucklagh, Mullaghduff, Mullanacre Lower, Mullanacre Upper, Mullynagolman, Rakeelan, Slievebrickan, Snugborough, Sralahan (also called "The Common").