Tyrconnell or Tirconnell was a political state in northwest Ireland up until 1601. It lay in the area now more commonly referred to as County Donegal, although the kingdom and later principality of Tyrconnell was larger than that, including parts of Sligo, Leitrim (in present-day Republic of Ireland), Tyrone, Fermanagh and a southern part of Londonderry (in present-day Northern Ireland). According to  Geoffrey Keating, it included the baronies of Carbury (, in County Sligo), Rosclogher (, in County Leitrim), and Magheraboy (, mainly Toorah or Tuath Ratha) and Firlurg (, in County Fermanagh). As such it had a size varying between that of Corsica (8,680 km²) and Lebanon (10,452 km²).