Wikipedia
Tomlagh
Tomlagh 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.