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Tomregan civil parish straddles the international border between the Republic of Ireland and Northern Ireland. The chief town of the parish is Ballyconnell, County Cavan. Most of Tomregan's constituent townlands are situate in County Cavan, with the remainder in County Fermanagh. The Roman Catholic parish of Tomregan was split up 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 total area of the civil parish is 10,600 statute acres.
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").
- A map of Tomregan townlands in Co.Cavan
- A map of Tomregan townlands in Co.Fermanagh
- Old Tomregan maps & Photos 
- The Tidy Towns of Ireland "Celebrating 50 years"
- Tomregan Genealogy Records