Tomlagh (from Irish: Tamhnach, meaning "field") is an ancient Irish district in what is now southern County Londonderry, Northern Ireland. Along with the ancient districts of Clandonnell, Glenconkeyne, and Killetra, it comprised the former barony of Loughinsholin. Tomlagh is stated as forming a four-or-five-mile-wide district running from Portglenone to Lough Beg. The townland of Annaghmore, near Castledawson is mentioned in Bodley's map from 1609 as lying within Tomlagh.
The name Tomlagh is believed to be derived from the Irish word Tamhnach, meaning field. This is turn is claimed to derive from Tamnach Ui Fhuradhrain, named after the descendants of Furudran, son Beic (one of the Three Collas).
- Éamon Ó Doibhlin; The Deanery of Tulach Óg, pgs 143-4. Seanchas Ardmhacha: Journal of the Armagh Diocesan Historical Society, Vol. 6, No. 1 (1971).
- Toner, Gregory; Place-names of Northern Ireland - Volume Five, County Londonderry I, The Moyola Valley, page 233. The Institute of Irish Studies - Queens University Belfast, 1996. ISBN 0-85389-613-5
- Notes on the Place Names of the Parishes and Townlands of the County of Londonderry, 1925, Alfred Moore Munn, Clerk of the Crown and Peace of the City and County of Londonderry
- Northern Archaeological Consultancy. "4. History of the Area of Proposed Route" (PDF). Appendix H: Cultural Heritage Report.
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