County Monaghan: Irish: Contae Mhuineacháin) is a county in Ireland. It is part of the Border Region and is in the province of Ulster. It is named after the town of Monaghan
Monaghan is the fifth smallest of the Republic's 26 counties in area and fourth smallest by population. It is the smallest of Ulster's nine counties in size and also the smallest in terms of population.
Notable mountains include Mullyash Mountain, Slieve Beagh (on the border with Tyrone and Fermanagh) and Coolberrin Hill (214 m, 702 ft). Lakes include Lough Egish, Lough Fea, Muckno Lough, Lough Avaghon, Inner Lough (in Dartrey Forest), Drumlona Lough, White Lough and Emy Lough.